array_search
(PHP 4 >= 4.0.5, PHP 5, PHP 7, PHP 8)
Searches the array for a given value and returns the first corresponding key if successful
Description
Searches for needle in haystack.
Parameters
needleThe searched value.
NoteIf
needleis a string, the comparison is done in a case-sensitive manner.haystackThe array.
strictIf the third parameter
strictis set to true then thearray_search()function will search for identical elements in thehaystack. This means it will also perform a strict type comparison of theneedlein thehaystack, and objects must be the same instance.
Return Values
Returns the key for needle if it is found in the array, false otherwise.
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 filter_value parameter instead.
Falseproblem
Examples
array_search() example
<?php
$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');
$key = array_search('green', $array); // $key = 2;
print_r($key);
$key = array_search('red', $array); // $key = 1;
print_r($key);
?>