Add watermark to jpg images php

watermark.php

<?php
$bg_img='bg.jpg';  //path to background (JPG ext) 
$logo_img='logo.png'; // path to logo (PNG ext.)

list($width_of_bg, $height_of_bg) = getimagesize($bg_img);   // to calculate background image width and height
list($width_of_logo, $height_of_logo) = getimagesize($logo_img);  //to calculate logo image width and height

//for bottom right
$logo_loc_width=$width_of_bg-$width_of_logo;  
$logo_loc_height=$height_of_bg-$height_of_logo;
// for different logo placement options see below comment

$bottom_image = imagecreatefromjpeg($bg_img); 
$top_image = imagecreatefrompng($logo_img); 
imagesavealpha($top_image, true); 
imagealphablending($top_image, true); 
imagecopy($bottom_image, $top_image, $logo_loc_width, $logo_loc_height, 0, 0, $width_of_logo, $height_of_logo); 
header('Content-type: image/png');
imagepng($bottom_image);  // for outputting image to browser
//imagepng($bottom_image, 'outputfile.png'); //to save file to server (uncomment this line for saving file to server)
imagedestroy($bottom_image);
imagedestroy($top_image);

?>

[Advance Options ]:

Option 1: Different Logo placement options
Replace Line 8-10 with following code
(Ex: if you want your logo to be placed on TOP RIGHT then replace the line 8-10 of above code(watermark.php) with
$logo_loc_width=$width_of_bg-$width_of_logo; $logo_loc_height=0; )

//for BOTTOM LEFT
$logo_loc_height=$height_of_bg-$height_of_logo;

//for CENTER
$logo_loc_width=$width_of_logo;
$logo_loc_height=$height_of_logo;

//for TOP LEFT
$logo_loc_width=0;
$logo_loc_height=0;

//for TOP RIGHT
$logo_loc_width=$width_of_bg-$width_of_logo;
$logo_loc_height=0;

**Todos / Areas of improvement **

• place png over png

If you have any problem/suggestion/bug/issue then pls comment to let us know!