How to implement image synthesis and generate watermarks in PHP (complete code)

The content of this article is about how to implement image synthesis and generate watermarks (complete code) in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

<?php
$dst_path =&#39;./upload/goods/2018/06-04/2bd2518a2e4e6d8bdab9f01434b9f754.png&#39;;
$src_path = &#39;./public/upload/weixin/20180620/a643cf1ee7dd5bda12270647ca543f60.png&#39;;
$hz = substr(strrchr($dst_path, &#39;.&#39;), 1);
$image = date("YmdHis").rand(100000,999999).".".$hz;
//创建图片的实例
$dst = imagecreatefromstring(file_get_contents($dst_path));
$src = imagecreatefromstring(file_get_contents($src_path));
//获取水印图片的宽高
$src_w =139;$src_h=58;
list($src_w,$src_h) = getimagesize($src_path);
//如果水印图片本身带透明色，则使用imagecopy方法
imagecopy($dst, $src, 85,85, 0, 0, $src_w, $src_h);
//输出图片
list($src_w, $src_h, $dst_type) = getimagesize($dst_path);
switch ($dst_type) {
    case 1://GIF

        header(&#39;Content-Type: image/gif&#39;);

        imagegif($dst,".".$image);        
        break;    
    case 2://JPG

        header(&#39;Content-Type: image/jpeg&#39;); 

        imagejpeg($dst,".".$image); 

        break; 

    case 3://PNG 

        header(&#39;Content-Type: image/png&#39;); 

        imagepng($dst,".".$image); 

        break; 

    default: 

        break;
} 

imagedestroy($dst); 

imagedestroy($src); 

return $image;

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