[PHP]สอบถามวิธีค้นหาชื่อไฟล์ภายใน Directory ผ่าน form

function erase_dir($dir) {
	foreach (glob($dir.'/*') as $filename) {
		chmod($filename, 0777);
		if(is_dir($filename)) { erase_dir($filename); echo "Erase Dir $filename<br />"; rmdir($filename); }
		else { echo "Erase File $filename<br />"; unlink($filename); }
	}
}

<?php
$mystring = 'abc';
$findme   = 'ab';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}
?>