PHP image processing using the Imagecopy function to add a picture watermark instance, _php tutorial

PHP image processing using the Imagecopy function to add a picture watermark instance,

Adding a watermark to a picture is also a common feature in image processing. As long as you see the pictures in the page can easily get, you hard to edit the pictures do not want to be easy to take away by others to use, so add a watermark to the image to determine the copyright, to prevent the image is stolen. Make watermark can use text (company name plus URL), you can also use pictures (company logo), picture watermark effect is better, because you can do some pictures to beautify the software. Use text to make a watermark, just draw some text on the picture. If you create a picture watermark, you need to understand the GD library Imagecopy () function, can copy part of the picture. The prototype of the function is as follows:

Copy the Code code as follows:
BOOL Imagecopy (Resource Dst_im,resource src_im,int dst_x,int dst_y,int src_x,int src_y,int src_w,int src_h)

The function is to start the coordinates of the src_im image from Src_x,src_y, with a width of src_w, and a portion of the height of Src_h copied to the Dst_im and dst_x positions in the image. Take a picture of JPEG format as an example, write a function watermark () that adds a watermark to a picture, as shown in the following code:

Copy the Code code as follows:
<?php
Add picture watermark to background image (location random), JPEG for background image, GIF for watermark picture format
function watermark ($filename, $water) {
Get the width and height of the background picture
List ($b _w, $b _h) = getimagesize ($filename);
Get the width and height of a watermark picture
List ($w _w, $w _h) = getimagesize ($water);
The position of the image in the background image is randomly starting position
$posX = rand (0, ($b _w-$w _w));
$posY = rand (0, ($b _h-$w _h));
Create a resource for a background picture
$back = Imagecreatefromjpeg ($filename);
Create a resource for a watermark picture
$water = Imagecreatefromgif ($water);
Use the Imagecopy () function to copy the watermark picture to the location specified in the background picture
Imagecopy ($back, $water, $posX, $posY, 0, 0, $w _w, $w _h);
Save a background picture with a watermark picture
Imagejpeg ($back, $filename);
Imagedestroy ($back);
Imagedestroy ($water);
}
Watermark ("Brophp.jpg", "logo.gif");
?>

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