- strpos: documentation ( source)
<?php
$array = [0 => 'blue pants', 1 => 'red pants', 2 => 'green pants', 3 => 'green pants'];
foreach ($array as $key => $value) {
if (strpos($value, 'red') !== false) {
echo "Key={$key}, Value: {$value}";
break;
}
}