PHP imagecopy function Add image watermark

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); } Output watermark Image Watermark ("Brophp.jpg", "logo.gif"); ?> Copy Code

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