CODE EXAMPLE FOR PHP

array find php

array_search ( mixed $needle , array $haystack , bool $strict = false ) : int|string|false

<?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;
?>