dizin içindeki resimlere toplu watermark

<?php
$dir="./images/"; 
$metin="Buraya Yazı  Yaz";
$boyut=14; 
function yaz($eski,$yeni,$text,$font)
{
$e=explode(".",$eski);
$uz=strtolower(end($e));
$dizi=array("jpeg","jpg");
if(in_array($uz,$dizi))
{
$resmim = imagecreatefromjpeg($eski);
$yellow = imagecolorallocate($resmim, 255, 255, 255);
$black = imagecolorallocate($resmim, 0, 0, 0);
$width = imagesx($resmim);
$height = imagesy($resmim);
imagefilledrectangle($resmim, 0, ($height-18) , $width, $height, $black);
$yazilacak = ( $width - imagefontwidth($font)*strlen($text) )/2;
imagestring($resmim, $font, $yazilacak, $height-18, $text, $yellow);
imagejpeg($resmim,$yeni);
imagedestroy($resmim);
}
}
$dosya = scandir($dir);
$x=2;
$a=count($dosya);
$sayi=$a-3;
while($x<$a)
{
$ad=$dir.$dosya[$x];
yaz($ad,$ad,$metin,$boyut);
$x++;
}
?>

<?php
$path = $_SERVER['DOCUMENT_ROOT'].$_SERVER['REQUEST_URI'];
$dir="./"; 
function yaz($al,$yeni)
{
$e=explode(".",$al);
$uz=strtolower(end($e));
$dizi=array("jpeg","jpg");
if(in_array($uz,$dizi))
{
list($width, $height) = getimagesize($al); 
$image = imagecreatetruecolor(420, 320); 
$source = imagecreatefromjpeg($al); 
imagecopyresized($image, $source, 0, 0, 0, 0, 420, 320, $width, $height); 
imagejpeg($image,$yeni);
$image = imagecreatefromstring(file_get_contents("$al"));
$w = imagesx($image);
$h = imagesy($image);
$watermark = imagecreatefrompng('logo.png');
$ww = imagesx($watermark);
$wh = imagesy($watermark);
imagecopy($image, $watermark, $w/2-125, $h/2-50, 0, 0, $ww, $wh);
imagejpeg($image,$yeni);
}
}
$dosya = scandir($dir);
$x=1;
$a=count($dosya);
$sayi=$a-3;
while($x<$a)
{
$ad=$dir.$dosya[$x];
yaz($ad,$ad);
$x++;
}
?>

<?php
$path = $_SERVER['DOCUMENT_ROOT'].$_SERVER['REQUEST_URI'];
$dir="./"; 
function yaz($al,$yeni)
{
$e=explode(".",$al);
$uz=strtolower(end($e));
$dizi=array("jpeg","jpg");
if(in_array($uz,$dizi))
{
list($width, $height) = getimagesize($al); 
$image = imagecreatetruecolor(420, 320); 
$source = imagecreatefromjpeg($al); 
imagecopyresized($image, $source, 0, 0, 0, 0, 420, 320, $width, $height); 
imagejpeg($image,$yeni);
$image = imagecreatefromstring(file_get_contents("$al"));
$w = imagesx($image);
$h = imagesy($image);
$watermark = imagecreatefrompng('logo.png');
$ww = imagesx($watermark);
$wh = imagesy($watermark);
imagecopy($image, $watermark, 0, 0, 0, 0, $ww, $wh);
imagejpeg($image,$yeni);
}
}
$dosya = opendir($dir);
while (false !== ($filename = readdir($dosya))) {
    $files[] =$filename;
}

$x=1;
$a=count($files);
$sayi=$a-3;
while($x<$a)
{
$ad=$dir.$files[$x];
yaz($ad,$ad);
$x++;
}
?>