how to find key of array in php code example

Example 1: get key of value array php

<?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;
?>

Example 2: how to lookup value inside object php

$array = [
    'clothes' => 't-shirt',
    'size'    => 'medium',
    'color'   => 'blue',
];
 
extract($array);
 
echo("$clothes $size $color"); // t-shirt medium blue