Image Extract PHP

<?php
/*==== PHP Script to get images from a folder and it's subfolders ======== */

// Change this to whichever folder you want to scan for images =========*/
$imgdir = "./images";

// You can modify this in case you need a different image extension
$strExt = "jpg";

// This is the full match pattern based upon your selections above
$pattern = "*.".$strExt;

/*==============================================================================*/

function GetFiles($files, $search) {
    // Split to name and filetype
    if(strpos($search,".")) {
        $baseExpr=substr($search,0,strpos($search,"."));
        $typeexp=substr($search,strpos($search,".")+1,strlen($search));
    } else {
        $baseExpr=$search;
        $typeexp="";
    }
    // Escape all regexp Characters
    $baseExpr=preg_quote($baseExpr);
    $typeexp=preg_quote($typeexp);

    // Allow ? and *
    $baseExpr=str_replace(array("\*","\?"), array(".*","."), $baseExpr);
    $typeexp=str_replace(array("\*","\?"), array(".*","."), $typeexp);

    // Search for Matches
    $i=0;
    foreach($files as $file) {
        $fname=basename($file);

        if(strpos($fname,".")) {
            $base=substr($fname,0,strpos($fname,"."));
            $type=substr($fname,strpos($fname,".")+1,strlen($fname));
        } else {
            $base=$fname;
            $type="";
        }

        if(preg_match("/^".$baseExpr."$/i",$base) && preg_match("/^".$typeexp."$/i",$type))  {
            $matches[$i]=$file;
            $i++;
        }
    }
    return $matches;
}

// Recursively returns all Files contained in given dir, including subdirs
function GetImages($dir,$files=array()) {
    if(!($res=opendir($dir))) exit("$dir doesn't exist!");
    while(($file=readdir($res))==TRUE) {
        if($file!="." && $file!="..")
            if(is_dir("$dir/$file"))
                $files=GetImages("$dir/$file",$files);
            else
                array_push($files,"$dir/$file");
    }
    closedir($res);
    return $files;
}

$matches = GetFiles(GetImages($imgdir),$pattern);

echo '<pre>';
var_dump($matches);
echo '</pre>';
?>