Adding watermark to all images in a folder

<?php
// add watermark to your website photos.
 
 // check if string end with specific substring
function endsWith($currentString, $target)
{
    $length = strlen($target);
    if ($length == 0) {
        return true;
    }

    return (substr($currentString, -$length) === $target);
}
// Loop on all JPG image exists in a folder
if ($handle = opendir('user_images')) {
    while (false !== ($entry = readdir($handle))) {
        if ($entry != "." && $entry != "..") {
          
			if (endsWith($entry,'.jpg')==0){
			// Skip images that are not JPG
			  echo   "<br/> $entry: is ignored.\n  ";
			  continue;
			}
			// Just printing the image file name
			 echo "<br/> $entry\n  ";
   

// setting the image path
$image_path = "./user_images/".$entry; 

// creating png image of watermark
$watermark = imagecreatefrompng('watermark.png');   

// getting dimensions of watermark image
$watermark_width = imagesx($watermark);
$watermark_height = imagesy($watermark);  

 
$image = imagecreatefromjpeg($image_path);
//something went wrong
if ($image === false) {
    return false;
}
// getting the dimensions of original image
$tragetedImageSize = getImageSize($image_path);
// placing the watermark 6px from bottom and right
$wmPositionX = $tragetedImageSize[0]- $watermark_width - 6;
$wmPositionY = $tragetedImageSize[1] - $watermark_height - 6;
// blending the images together
imagealphablending($image, true);
imagealphablending($watermark, true);
// creating the new image with watermark on it,
imagecopy($image, $watermark, $wmPositionX, $wmPositionY, 0, 0, $watermark_width, $watermark_height);
// saving the created image into current directory
imagejpeg($image, "./$entry");
// Freeing  memory
imagedestroy($image);
imagedestroy($watermark);

     }
    }
    closedir($handle);
}
?>