water.php

<?php
    $folder = '/path/to/folder/';
    $watermark = '/path/to/Logo.jpg';
    
    $files = scandir($folder);
    foreach($files as $file) {
        //do your work here
        var_dump($folder.$file);
        
        // Load the stamp and the photo to apply the watermark to
        $stamp = imagecreatefromjpeg($watermark);
        $im = imagecreatefromjpeg($folder.$file);
        
        // Set the margins for the stamp and get the height/width of the stamp image
        $marge_right = 10;
        $marge_bottom = 10;
        $sx = imagesx($stamp);
        $sy = imagesy($stamp);
        
        // Copy the stamp image onto our photo using the margin offsets and the photo 
        // width to calculate positioning of the stamp. 
        imagecopy($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp));
        
        imagepng($im, $folder.$file);
        imagedestroy($im);
        
    }
?>