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The in_array() function searches an array for a specific value. Note: If the search parameter is a string and the type parameter is set to TRUE, the search is case-sensitive.
Table of Contents. array — Create an array. array_change_key_case — Changes the case of all keys in an array. array_chunk — Split an array into chunks. array_column — Return the values from a single column in the input array. array_combine — Creates an array by using one array for keys and another for its values.
Array Functions. Change language: in_array. (PHP 4, PHP 5, PHP 7, PHP 8) in_array — Checks if a value exists in an array. Description ¶. in_array (mixed $needle, array $haystack, bool $strict = false): bool. Searches for needle in haystack using loose comparison unless strict is set. Parameters ¶. needle. The searched value. Note:
in_array only operates on a one dimensional array, so you need to loop over each sub array and run in_array on each. As others have noted, this will only for for a 2-dimensional array. If you have more nested arrays, a recursive version would be better. See the other answers for examples of that.
PHP Arrays Single, Multi-dimensional, Associative and Object Arrays in PHP 7 — Steve Prettyman
PHP Functions Essential Reference is a detailed and practical function reference for the PHP programming language. Concise and authoritative, this working programmer's guide covers the core function groups plus 300 additional commonly used PHP functions, and details 800 more functions on the book's web site.
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