- preg_match: documentation ( source)
- array_keys: documentation ( source)
- join: documentation ( source)
<?php
$arr = array('remboursement' => 'remboursement');
$key = 'REM';
if(preg_match("/".$key."/i", join(",", array_keys($arr)))){
echo "oui";
}
else{
echo "non";
}