scandir( $path) returns the searched result in array.

$result = scandir(directory, order, context)

• it returns false on failure.

<?php

$r = scandir("/etc/");
print_r( $r);

?>

// Programmed by Chun Kang - 2020-03-27
function findfiles( $path, $regexp, $order=0)
{
        $r = scandir( $path, $order); // $order: 0->ascending / 1->descending
        if ($r==true)
        {
                $i=count($r)-1;
                while($i>=0)
                {
                        if (!preg_match('/' . $regexp . '/', $r[$i])) unset($r[$i]);
                        $i--;
                }
                return $r;
        }
}


$r = findfiles( "/repostirory", "qsok(.*)mysql");
print_r($r);