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Как проверить ключ в php массиве — Q&A Хекслет
2026-02-26 20:28 Diff
https://ru.hexlet.io/qna/php/questions/kak-proverit-klyuch-v-php-massive
Ответы

Функция key_exists().
Функция PHP key_exists() используется для проверки существования заданного ключа или индекса в массиве. Это псевдоним функции array_key_exists(). Эта функция появилась в PHP 4.0.6.
Пример:
<?php $array = [ 'fruit1' => 'apple', 'fruit2' => 'orange', 'fruit3' => 'grape', 'fruit4' => 'apple', 'fruit5' => 'apple' ]; var_dump(key_exists('fruit1', $array)) // => true var_dump(key_exists('fruit100', $array)) // => false
Узнать есть ли какой-то ключ в массиве можно с помощью функции array_key_exists().
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по веб-разработке&quot;,&quot;slug&quot;:&quot;web_development&quot;,&quot;short_name&quot;:&quot;Веб-разработка&quot;,&quot;order&quot;:190,&quot;state&quot;:&quot;published&quot;,&quot;category_slug&quot;:&quot;courses_web_development&quot;},&quot;answerDto&quot;:{&quot;id&quot;:null,&quot;body&quot;:&quot;&quot;,&quot;meta&quot;:{&quot;model&quot;:&quot;question_answer&quot;,&quot;relations&quot;:{}}},&quot;question&quot;:{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:1,&quot;title&quot;:&quot;PHP&quot;,&quot;slug&quot;:&quot;php&quot;,&quot;questions_count&quot;:227,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:570,&quot;slug&quot;:&quot;php-massivy&quot;,&quot;name&quot;:&quot;php массивы&quot;}],&quot;id&quot;:101,&quot;answers_count&quot;:2,&quot;slug&quot;:&quot;kak-proverit-klyuch-v-php-massive&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как проверить ключ в php массиве&quot;,&quot;created_at&quot;:&quot;2021-10-15T13:53:44.764Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:183,&quot;related_stacks_count&quot;:5},&quot;answers&quot;:[{&quot;user&quot;:{&quot;id&quot;:289558,&quot;email&quot;:&quot;autlevaslan@yandex.ru&quot;,&quot;first_name&quot;:&quot;Аслан&quot;,&quot;last_name&quot;:&quot;Аутлев&quot;,&quot;telegram&quot;:&quot;Aslanav013&quot;,&quot;full_name&quot;:&quot;Аслан Аутлев&quot;,&quot;removed&quot;:false},&quot;question&quot;:{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:1,&quot;title&quot;:&quot;PHP&quot;,&quot;slug&quot;:&quot;php&quot;,&quot;questions_count&quot;:227,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:570,&quot;slug&quot;:&quot;php-massivy&quot;,&quot;name&quot;:&quot;php массивы&quot;}],&quot;id&quot;:101,&quot;answers_count&quot;:2,&quot;slug&quot;:&quot;kak-proverit-klyuch-v-php-massive&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как проверить ключ в php массиве&quot;,&quot;created_at&quot;:&quot;2021-10-15T13:53:44.764Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:183,&quot;related_stacks_count&quot;:5},&quot;id&quot;:1102,&quot;state&quot;:&quot;active&quot;,&quot;body&quot;:&quot;Функция `key_exists()`.\r\n\r\n```text\r\nkey_exists(string|int $key, array $array)\r\n```\r\n\r\nФункция PHP `key_exists()` используется для проверки существования заданного ключа или индекса в массиве. Это псевдоним функции `array_key_exists()`. Эта функция появилась в PHP 4.0.6.\r\n\r\nПример:\r\n\r\n```\r\n&lt;?php\r\n\r\n$array = [\r\n    &#x27;fruit1&#x27; =&gt; &#x27;apple&#x27;,\r\n    &#x27;fruit2&#x27; =&gt; &#x27;orange&#x27;,\r\n    &#x27;fruit3&#x27; =&gt; &#x27;grape&#x27;,\r\n    &#x27;fruit4&#x27; =&gt; &#x27;apple&#x27;,\r\n    &#x27;fruit5&#x27; =&gt; &#x27;apple&#x27;\r\n];\r\n\r\nvar_dump(key_exists(&#x27;fruit1&#x27;, $array)) // =&gt; true\r\n\r\nvar_dump(key_exists(&#x27;fruit100&#x27;, $array)) // =&gt; false\r\n```&quot;,&quot;votes_up_count&quot;:0,&quot;votes_down_count&quot;:0,&quot;created_at&quot;:&quot;2022-11-08T14:16:25.916Z&quot;,&quot;user_id&quot;:289558,&quot;category_slug&quot;:&quot;php&quot;},{&quot;user&quot;:{&quot;id&quot;:226258,&quot;email&quot;:&quot;rmn.shkv@gmail.com&quot;,&quot;first_name&quot;:&quot;Roman&quot;,&quot;last_name&quot;:&quot;Ashikov&quot;,&quot;telegram&quot;:&quot;it_heisenberg&quot;,&quot;full_name&quot;:&quot;Roman Ashikov&quot;,&quot;removed&quot;:false},&quot;question&quot;:{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:1,&quot;title&quot;:&quot;PHP&quot;,&quot;slug&quot;:&quot;php&quot;,&quot;questions_count&quot;:227,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:570,&quot;slug&quot;:&quot;php-massivy&quot;,&quot;name&quot;:&quot;php массивы&quot;}],&quot;id&quot;:101,&quot;answers_count&quot;:2,&quot;slug&quot;:&quot;kak-proverit-klyuch-v-php-massive&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как проверить ключ в php массиве&quot;,&quot;created_at&quot;:&quot;2021-10-15T13:53:44.764Z&quot;,&quot;details&quot;:&quot;&quot;,&quot;best_answer_id&quot;:183,&quot;related_stacks_count&quot;:5},&quot;id&quot;:183,&quot;state&quot;:&quot;active&quot;,&quot;body&quot;:&quot;Узнать есть ли какой-то ключ в массиве можно с помощью функции `array_key_exists()`.\r\n\r\n```php\r\n&lt;?php\r\n\r\n$collection = [&#x27;foo&#x27; =&gt; &#x27;bar&#x27;, &#x27;fizz&#x27; =&gt; &#x27;bazz&#x27;];\r\narray_key_exists(&#x27;fizz&#x27;, $collection); // true\r\n```&quot;,&quot;votes_up_count&quot;:0,&quot;votes_down_count&quot;:0,&quot;created_at&quot;:&quot;2021-12-16T03:15:17.254Z&quot;,&quot;user_id&quot;:226258,&quot;category_slug&quot;:&quot;php&quot;}],&quot;relatedQuestions&quot;:[{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:1,&quot;title&quot;:&quot;PHP&quot;,&quot;slug&quot;:&quot;php&quot;,&quot;questions_count&quot;:227,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:570,&quot;slug&quot;:&quot;php-massivy&quot;,&quot;name&quot;:&quot;php массивы&quot;}],&quot;id&quot;:63,&quot;answers_count&quot;:2,&quot;slug&quot;:&quot;kak-peredat-massiv-dannyh-iz-ajax-v-php&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как 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массивов\r&quot;,&quot;created_at&quot;:&quot;2021-10-15T13:53:44.222Z&quot;,&quot;details&quot;:null,&quot;best_answer_id&quot;:1687,&quot;related_stacks_count&quot;:5},{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:1,&quot;title&quot;:&quot;PHP&quot;,&quot;slug&quot;:&quot;php&quot;,&quot;questions_count&quot;:227,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[{&quot;id&quot;:570,&quot;slug&quot;:&quot;php-massivy&quot;,&quot;name&quot;:&quot;php массивы&quot;}],&quot;id&quot;:65,&quot;answers_count&quot;:1,&quot;slug&quot;:&quot;kak-peredat-php-massiv-iz-fayla-csv&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как передать php массив из файла csv 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mysql\r&quot;,&quot;created_at&quot;:&quot;2021-10-15T13:53:44.033Z&quot;,&quot;details&quot;:null,&quot;best_answer_id&quot;:1599,&quot;related_stacks_count&quot;:5},{&quot;creator&quot;:{&quot;id&quot;:363630,&quot;email&quot;:&quot;a.agaphonov@ya.ru&quot;,&quot;first_name&quot;:&quot;Человек-Молекула&quot;,&quot;last_name&quot;:&quot;&quot;,&quot;telegram&quot;:null,&quot;full_name&quot;:&quot;Человек-Молекула&quot;,&quot;removed&quot;:false},&quot;category&quot;:{&quot;id&quot;:1,&quot;title&quot;:&quot;PHP&quot;,&quot;slug&quot;:&quot;php&quot;,&quot;questions_count&quot;:227,&quot;locale&quot;:&quot;ru&quot;},&quot;tags&quot;:[],&quot;id&quot;:89,&quot;answers_count&quot;:1,&quot;slug&quot;:&quot;kak-peredat-php-massiv-metodom-post&quot;,&quot;state&quot;:&quot;published&quot;,&quot;title&quot;:&quot;Как передать php массив методом post\r&quot;,&quot;created_at&quot;:&quot;2021-10-15T13:53:44.447Z&quot;,&quot;details&quot;:null,&quot;best_answer_id&quot;:1580,&quot;related_stacks_count&quot;:5}],&quot;relatedLandings&quot;:[{&quot;stack&quot;:{&quot;id&quot;:2,&quot;slug&quot;:&quot;php&quot;,&quot;title&quot;:&quot;PHP-разработчик&quot;,&quot;audience&quot;:&quot;for_beginners&quot;,&quot;start_type&quot;:&quot;weekly&quot;,&quot;pricing_model&quot;:&quot;purchase&quot;,&quot;priority&quot;:&quot;high&quot;,&quot;kind&quot;:&quot;profession&quot;,&quot;state&quot;:&quot;published&quot;,&quot;stack_state&quot;:&quot;finished&quot;,&quot;order&quot;:60,&quot;duration_in_months&quot;:10},&quot;id&quot;:1,&quot;slug&quot;:&quot;php&quot;,&quot;title&quot;:&quot;РНР-разработчик&quot;,&quot;subtitle&quot;:&quot;Изучите PHP и Laravel для разработки и проектирования REST API&quot;,&quot;subtitle_for_lists&quot;:&quot;Изучите PHP и Laravel для разработки и проектирования REST 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PHP&quot;,&quot;subtitle&quot;:&quot;Навык понимать программы на глубоком уровне, уверенно проходить собеседования и решать сложные задачи&quot;,&quot;subtitle_for_lists&quot;:&quot;Навык фундаментального понимания программ на PHP&quot;,&quot;locale&quot;:&quot;ru&quot;,&quot;current&quot;:true,&quot;duration_in_months_text&quot;:&quot;1 месяц&quot;,&quot;stack_slug&quot;:&quot;php-sicp&quot;,&quot;price_text&quot;:&quot;от 3 900 ₽&quot;,&quot;duration_text&quot;:&quot;1 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Это псевдоним функции `array_key_exists()`. Эта функция появилась в PHP 4.0.6.\r\n\r\nПример:\r\n\r\n```\r\n&lt;?php\r\n\r\n$array = [\r\n    &apos;fruit1&apos; =&gt; &apos;apple&apos;,\r\n    &apos;fruit2&apos; =&gt; &apos;orange&apos;,\r\n    &apos;fruit3&apos; =&gt; &apos;grape&apos;,\r\n    &apos;fruit4&apos; =&gt; &apos;apple&apos;,\r\n    &apos;fruit5&apos; =&gt; &apos;apple&apos;\r\n];\r\n\r\nvar_dump(key_exists(&apos;fruit1&apos;, $array)) // =&gt; true\r\n\r\nvar_dump(key_exists(&apos;fruit100&apos;, $array)) // =&gt; false\r\n```","datePublished":"2022-11-08T14:16:25.916Z","upvoteCount":0,"author":{"@type":"Person","name":"Аслан Аутлев"},"url":"https://ru.hexlet.io/qna/php/questions/kak-proverit-klyuch-v-php-massive#answer-1102"}]}}</script><div style="--container-size:var(--container-size-lg);margin-top:var(--mantine-spacing-xl);height:100%" class="m_7485cace mantine-Container-root" data-size="lg" data-strategy="block"><script 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15v3"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">4 года назад</p></div><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-user "><path d="M8 7a4 4 0 1 0 8 0a4 4 0 0 0 -8 0"></path><path d="M6 21v-2a4 4 0 0 1 4 -4h4a4 4 0 0 1 4 4v2"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">Человек-Молекула</p></div></div><div role="link" tabindex="0" style="cursor:pointer"><button style="display:block;width:100%" class="mantine-focus-auto m_87cf2631 mantine-UnstyledButton-root" type="button" aria-label="Присоединяйтесь к нашему Telegram-сообществу"><div 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style="--title-fw:var(--mantine-h2-font-weight);--title-lh:var(--mantine-h2-line-height);--title-fz:var(--mantine-h2-font-size);margin-block:var(--mantine-spacing-xl)" class="m_8a5d1357 mantine-Title-root" data-order="2">Ответы</h2><div style="margin-bottom:var(--mantine-spacing-xl);padding:var(--mantine-spacing-lg)" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true" id="answer-1102"><div style="--group-gap:calc(1.125rem * var(--mantine-scale));--group-align:stretch;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><div style="--stack-gap:var(--mantine-spacing-md);--stack-align:stretch;--stack-justify:flex-start;font-size:var(--mantine-font-size-h1);font-weight:lighter;text-align:center" class="m_6d731127 mantine-Stack-root">0<a style="color:inherit" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/qna/php/questions/kak-proverit-klyuch-v-php-massive/answers/1102/vote"><div style="--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-thumb-up "><path d="M7 11v8a1 1 0 0 1 -1 1h-2a1 1 0 0 1 -1 -1v-7a1 1 0 0 1 1 -1h3a4 4 0 0 0 4 -4v-1a2 2 0 0 1 4 0v5h3a2 2 0 0 1 2 2l-1 5a2 3 0 0 1 -2 2h-7a3 3 0 0 1 -3 -3"></path></svg></div></a></div><div style="--stack-gap:var(--mantine-spacing-md);--stack-align:stretch;--stack-justify:flex-start;width:100%;min-width:0rem" class="m_6d731127 mantine-Stack-root"><div style="margin-bottom:auto" class="m_d08caa0 mantine-Typography-root"><p>Функция <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">key_exists()</code>.</p>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">key_exists(string|int $key, array $array)</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div>
<p>Функция PHP <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">key_exists()</code> используется для проверки существования заданного ключа или индекса в массиве. Это псевдоним функции <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">array_key_exists()</code>. Эта функция появилась в PHP 4.0.6.</p>
<p>Пример:</p>
<code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">&lt;?php

$array = [
    &#x27;fruit1&#x27; =&gt; &#x27;apple&#x27;,
    &#x27;fruit2&#x27; =&gt; &#x27;orange&#x27;,
    &#x27;fruit3&#x27; =&gt; &#x27;grape&#x27;,
    &#x27;fruit4&#x27; =&gt; &#x27;apple&#x27;,
    &#x27;fruit5&#x27; =&gt; &#x27;apple&#x27;
];

var_dump(key_exists(&#x27;fruit1&#x27;, $array)) // =&gt; true

var_dump(key_exists(&#x27;fruit100&#x27;, $array)) // =&gt; false</code></div><div class="m_3eebeb36 mantine-Divider-root" data-orientation="horizontal" role="separator"></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:flex-start;--group-wrap:wrap;font-size:var(--mantine-font-size-sm)" class="m_4081bf90 mantine-Group-root"><div style="--group-gap:var(--mantine-spacing-xs);--group-align:center;--group-justify:flex-start;--group-wrap:wrap;margin-inline-start:auto" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-calendar "><path d="M4 7a2 2 0 0 1 2 -2h12a2 2 0 0 1 2 2v12a2 2 0 0 1 -2 2h-12a2 2 0 0 1 -2 -2v-12"></path><path d="M16 3v4"></path><path d="M8 3v4"></path><path d="M4 11h16"></path><path d="M11 15h1"></path><path d="M12 15v3"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">3 года назад</p></div><div style="--group-gap:var(--mantine-spacing-xs);--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-user "><path d="M8 7a4 4 0 1 0 8 0a4 4 0 0 0 -8 0"></path><path d="M6 21v-2a4 4 0 0 1 4 -4h4a4 4 0 0 1 4 4v2"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">Аслан Аутлев</p></div></div></div></div></div><div style="margin-bottom:var(--mantine-spacing-xl);padding:var(--mantine-spacing-lg)" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true" id="answer-183"><div style="--group-gap:calc(1.125rem * var(--mantine-scale));--group-align:stretch;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><div style="--stack-gap:var(--mantine-spacing-md);--stack-align:stretch;--stack-justify:flex-start;font-size:var(--mantine-font-size-h1);font-weight:lighter;text-align:center" class="m_6d731127 mantine-Stack-root">0<a style="color:inherit" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/qna/php/questions/kak-proverit-klyuch-v-php-massive/answers/183/vote"><div style="--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-thumb-up "><path d="M7 11v8a1 1 0 0 1 -1 1h-2a1 1 0 0 1 -1 -1v-7a1 1 0 0 1 1 -1h3a4 4 0 0 0 4 -4v-1a2 2 0 0 1 4 0v5h3a2 2 0 0 1 2 2l-1 5a2 3 0 0 1 -2 2h-7a3 3 0 0 1 -3 -3"></path></svg></div></a><div style="--ti-bg:transparent;--ti-color:var(--mantine-color-indigo-light-color);--ti-bd:calc(0.0625rem * var(--mantine-scale)) solid transparent;color:inherit" class="m_7341320d mantine-ThemeIcon-root" data-variant="transparent"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-check "><path d="M5 12l5 5l10 -10"></path></svg></div></div><div style="--stack-gap:var(--mantine-spacing-md);--stack-align:stretch;--stack-justify:flex-start;width:100%;min-width:0rem" class="m_6d731127 mantine-Stack-root"><div style="margin-bottom:auto" class="m_d08caa0 mantine-Typography-root"><p>Узнать есть ли какой-то ключ в массиве можно с помощью функции <code style="margin-bottom:var(--mantine-spacing-lg)" class="m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight m_e597c321 mantine-CodeHighlight-codeHighlight m_dfe9c588 mantine-InlineCodeHighlight-inlineCodeHighlight">array_key_exists()</code>.</p>
<div style="margin-bottom:var(--mantine-spacing-lg)" class="m_e597c321 mantine-CodeHighlight-codeHighlight" dir="ltr"><div class="m_be7e9c9c mantine-CodeHighlight-controls"><button style="--ai-bg:transparent;--ai-hover:transparent;--ai-color:inherit;--ai-bd:none" class="mantine-focus-auto mantine-active m_d498bab7 mantine-CodeHighlight-control m_8d3f4000 mantine-ActionIcon-root m_87cf2631 mantine-UnstyledButton-root" data-variant="none" type="button" aria-label="Copy code"><span class="m_8d3afb97 mantine-ActionIcon-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><path stroke="none" d="M0 0h24v24H0z" fill="none"></path><path d="M8 8m0 2a2 2 0 0 1 2 -2h8a2 2 0 0 1 2 2v8a2 2 0 0 1 -2 2h-8a2 2 0 0 1 -2 -2z"></path><path d="M16 8v-2a2 2 0 0 0 -2 -2h-8a2 2 0 0 0 -2 2v8a2 2 0 0 0 2 2h2"></path></svg></span></button></div><div style="--scrollarea-scrollbar-size:calc(0.25rem * var(--mantine-scale));--sa-corner-width:0px;--sa-corner-height:0px" class="m_f744fd40 mantine-CodeHighlight-scrollarea m_d57069b5 mantine-ScrollArea-root" dir="ltr"><div style="overflow-x:hidden;overflow-y:hidden;overscroll-behavior-inline:none" class="m_c0783ff9 mantine-ScrollArea-viewport" data-scrollbars="xy"><div class="m_b1336c6 mantine-ScrollArea-content"><pre class="m_2c47c4fd mantine-CodeHighlight-pre" style="padding:0"><code class="m_5caae6d3 mantine-CodeHighlight-code">&lt;?php

$collection = [&#x27;foo&#x27; =&gt; &#x27;bar&#x27;, &#x27;fizz&#x27; =&gt; &#x27;bazz&#x27;];
array_key_exists(&#x27;fizz&#x27;, $collection); // true</code></pre></div></div></div><button class="mantine-focus-auto m_c9378bc2 mantine-CodeHighlight-showCodeButton m_87cf2631 mantine-UnstyledButton-root" data-hidden="true" type="button">Expand code</button></div></div><div class="m_3eebeb36 mantine-Divider-root" data-orientation="horizontal" role="separator"></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:center;--group-justify:flex-start;--group-wrap:wrap;font-size:var(--mantine-font-size-sm)" class="m_4081bf90 mantine-Group-root"><div style="--group-gap:var(--mantine-spacing-xs);--group-align:center;--group-justify:flex-start;--group-wrap:wrap;margin-inline-start:auto" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-calendar "><path d="M4 7a2 2 0 0 1 2 -2h12a2 2 0 0 1 2 2v12a2 2 0 0 1 -2 2h-12a2 2 0 0 1 -2 -2v-12"></path><path d="M16 3v4"></path><path d="M8 3v4"></path><path d="M4 11h16"></path><path d="M11 15h1"></path><path d="M12 15v3"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">4 года назад</p></div><div style="--group-gap:var(--mantine-spacing-xs);--group-align:center;--group-justify:flex-start;--group-wrap:wrap" class="m_4081bf90 mantine-Group-root"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round" class="tabler-icon tabler-icon-user "><path d="M8 7a4 4 0 1 0 8 0a4 4 0 0 0 -8 0"></path><path d="M6 21v-2a4 4 0 0 1 4 -4h4a4 4 0 0 1 4 4v2"></path></svg><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root" data-inherit="true">Roman Ashikov</p></div></div></div></div></div><style 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9.56464L11.158 6.13523C11.3595 5.94637 11.6759 5.95657 11.8648 6.15803C12.0536 6.35949 12.0434 6.67591 11.842 6.86477L7.84197 10.6148C7.64964 10.7951 7.35036 10.7951 7.15803 10.6148L3.15803 6.86477C2.95657 6.67591 2.94637 6.35949 3.13523 6.15803Z" fill="currentColor" fill-rule="evenodd" clip-rule="evenodd"></path></svg></button></div><div class="m_a2dae653 mantine-Carousel-viewport" data-type="media"><div class="m_fcd81474 mantine-Carousel-container __m__-_R_4bbdiub_" data-orientation="horizontal"><div class="m_d98df724 mantine-Carousel-slide" data-orientation="horizontal"><div tabindex="0" style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/programs/php?promo_name=programs_list&amp;promo_position=qna_question&amp;promo_creative=catalog_card&amp;promo_type=card" target="_blank"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">10 месяцев</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">С нуля</span></div><p style="margin-bottom:var(--mantine-spacing-sm);font-size:var(--mantine-font-size-h5);font-weight:bold" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">РНР-разработчик</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Изучите PHP и Laravel для разработки и проектирования REST API</p><div style="margin-top:auto" class=""><div class="m_4451eb3a mantine-Center-root"><img style="opacity:0.8;width:70%" class="m_9e117634 mantine-Image-root mantine-visible-from-xs" src="https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6Mzk5MiwicHVyIjoiYmxvYl9pZCJ9fQ==--e9d0f30948ea766a7e6bc3e3d56c192344d45fb8/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Programming-cuate%20(1).png" alt="РНР-разработчик" loading="eager"/></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:end;--group-justify:space-between;--group-wrap:wrap;margin-top:var(--mantine-spacing-xs)" class="m_4081bf90 mantine-Group-root"><p style="font-size:var(--mantine-font-size-xl)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">от 5 650 ₽</p><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Посмотреть →</p></div></div></div></a></div></div><div class="m_d98df724 mantine-Carousel-slide" data-orientation="horizontal"><div tabindex="0" style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/programs/php-oop?promo_name=programs_list&amp;promo_position=qna_question&amp;promo_creative=catalog_card&amp;promo_type=card" target="_blank"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">2 месяца</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Для продвинутых</span></div><p style="margin-bottom:var(--mantine-spacing-sm);font-size:var(--mantine-font-size-h5);font-weight:bold" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">ООП В PHP</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Изучите архитектуру и чистый код на PHP</p><div style="margin-top:auto" class=""><div class="m_4451eb3a mantine-Center-root"><img style="opacity:0.8;width:70%" class="m_9e117634 mantine-Image-root mantine-visible-from-xs" src="https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6Mzc1MSwicHVyIjoiYmxvYl9pZCJ9fQ==--e5793a1818ff43d73135cc7ed88c1998d7650470/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Developer%20activity-bro.png" alt="ООП В PHP" loading="eager"/></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:end;--group-justify:space-between;--group-wrap:wrap;margin-top:var(--mantine-spacing-xs)" class="m_4081bf90 mantine-Group-root"><p style="font-size:var(--mantine-font-size-xl)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">от 3 900 ₽</p><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Посмотреть →</p></div></div></div></a></div></div><div class="m_d98df724 mantine-Carousel-slide" data-orientation="horizontal"><div tabindex="0" style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/programs/php-sicp?promo_name=programs_list&amp;promo_position=qna_question&amp;promo_creative=catalog_card&amp;promo_type=card" target="_blank"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">1 месяц</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Для продвинутых</span></div><p style="margin-bottom:var(--mantine-spacing-sm);font-size:var(--mantine-font-size-h5);font-weight:bold" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">СИКП на PHP</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Навык фундаментального понимания программ на PHP</p><div style="margin-top:auto" class=""><div class="m_4451eb3a mantine-Center-root"><img style="opacity:0.8;width:70%" class="m_9e117634 mantine-Image-root mantine-visible-from-xs" src="https://hexlet.io/rails/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6Mzc2MywicHVyIjoiYmxvYl9pZCJ9fQ==--61c43d4881ca8feecc6f37dfafdc4e304f34b52f/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJ3ZWJwIiwicmVzaXplX3RvX2xpbWl0IjpbNDAwLDQwMF0sInNhdmVyIjp7InF1YWxpdHkiOjg1fX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--5b6f46dacd1af664f27558553a58076185091823/Software%20engineer-bro.png" alt="СИКП на PHP" loading="eager"/></div><div style="--group-gap:var(--mantine-spacing-md);--group-align:end;--group-justify:space-between;--group-wrap:wrap;margin-top:var(--mantine-spacing-xs)" class="m_4081bf90 mantine-Group-root"><p style="font-size:var(--mantine-font-size-xl)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">от 3 900 ₽</p><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Посмотреть →</p></div></div></div></a></div></div><div class="m_d98df724 mantine-Carousel-slide" data-orientation="horizontal"><div tabindex="0" style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/programs/php-phpunit-testing?promo_name=programs_list&amp;promo_position=qna_question&amp;promo_creative=catalog_card&amp;promo_type=card" target="_blank"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">4 месяца</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Для продвинутых</span></div><p 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style="--group-gap:var(--mantine-spacing-md);--group-align:end;--group-justify:space-between;--group-wrap:wrap;margin-top:var(--mantine-spacing-xs)" class="m_4081bf90 mantine-Group-root"><p style="font-size:var(--mantine-font-size-xl)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">от 3 900 ₽</p><p style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Посмотреть →</p></div></div></div></a></div></div><div class="m_d98df724 mantine-Carousel-slide" data-orientation="horizontal"><div tabindex="0" style="cursor:pointer;height:100%"><a style="text-decoration:none" class="mantine-focus-auto m_849cf0da m_b6d8b162 mantine-Text-root mantine-Anchor-root" data-underline="hover" href="/programs/fullstack-php?promo_name=programs_list&amp;promo_position=qna_question&amp;promo_creative=catalog_card&amp;promo_type=card" target="_blank"><div style="height:100%" class="m_e615b15f mantine-Card-root m_1b7284a3 mantine-Paper-root" data-with-border="true"><div style="--group-gap:calc(0.25rem * var(--mantine-scale));--group-align:center;--group-justify:flex-start;--group-wrap:nowrap" class="m_4081bf90 mantine-Group-root"><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">16 месяцев</span><span class="mantine-focus-auto m_b6d8b162 mantine-Text-root">·</span><span style="font-size:var(--mantine-font-size-sm)" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">С нуля</span></div><p style="margin-bottom:var(--mantine-spacing-sm);font-size:var(--mantine-font-size-h5);font-weight:bold" class="mantine-focus-auto m_b6d8b162 mantine-Text-root">Fullstack-разработчик на PHP</p><p class="mantine-focus-auto m_b6d8b162 mantine-Text-root"></p><div style="margin-top:auto" class=""><div class="m_4451eb3a mantine-Center-root"><img style="opacity:0.8;width:70%" class="m_9e117634 mantine-Image-root mantine-visible-from-xs" 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