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(PHP 4 >= 4.0.5, PHP 5)

array_search --  Searches the array for a given value and returns the corresponding key if successful

Description

mixed array_search ( mixed needle, array haystack [, bool strict] )

Searches haystack for needle and returns the key if it is found in the array, FALSE otherwise.

If the optional third parameter strict is set to TRUE then the array_search() will also check the types of the needle in the haystack .

If needle is found in haystack more than once, the first matching key is returned. To return the keys for all matching values, use array_keys() with the optional search_value parameter instead.

Example 1. array_search() example

<?php
$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

$key = array_search('green', $array); // $key = 2;
$key = array_search('red', $array);   // $key = 1;
?>

Warning

This function may return Boolean FALSE , but may also return a non-Boolean value which evaluates to FALSE , such as 0 or "". Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

Related Function(s)

array_keys()

array_values()

array_key_exists()

in_array()