Add Watermark to Images using PHP

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<?php
/**
* Adds a watermark / stamp to images.
*
* @author Carl Victor Fontanos
* @authoruri www.carlofontanos.com
* @date 01-20-2015
*
*/
function cvf_add_watermark($image_path, $stamp_path){

$file = pathinfo($image_path);

// Declare valid formats
$valid_formats = array("jpg", "jpeg", "gif", "png");

// Check if image exists
if(!file_exists($image_path)){
return false;

// Check if file meets extension requirements
} else if(!in_array($file['extension'], $valid_formats)) {
return false;

} else {

// Load the stamp and the photo to apply the watermark to
$stamp = imagecreatefrompng($stamp_path);

// Designate image depending on extension
if($file['extension'] == 'jpg' || $file['extension'] == 'jpeg'){
$image = imagecreatefromjpeg($image_path);
} else if ($file['extension'] == 'png'){
$image = imagecreatefrompng($image_path);
} else if ($file['extension'] == 'gif'){
$image = imagecreatefromgif($image_path);
}

// 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(
$image,
$stamp,
imagesx($image) - $sx - $marge_right,
imagesy($image) - $sy - $marge_bottom,
0,
0,
imagesx($stamp),
imagesy($stamp)
);

// Output as PNG file and free memory
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
}
}

?>

Usage

1	echo cvf_add_watermark('https://carlofontanos.com/path/to/image/example.png', 'watermark.png');

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