PHP之水印

<?php

    //水印制作
    $create_func_list = array(

        'image/jpeg' => 'imagecreatefromjpeg',
        'image/png'  => 'imagecreatefrompng'
    );

    $output_func_list =array(

        'image/jpeg' => 'image/jpeg'

    );

    //待加水印的图片
    $dst_file = 'psb.jpg';
    $stamp_file = 'stamp.jpg';

    $dst_info = getimagesize($dst_file);
    $dst_mime = $dst_info['mime'];

    $dst_create_func = $create_func_list[$dst_mime];
    $dst_image = $dst_create_func($dst_file);

    $stamp_image = imagecreatefromjpeg($stamp_file);
    $stamp_w = imagesx($stamp_image);
    $stamp_h = imagesy($stamp_image);

    //印章位置
    $dst_x = 200;
    $dst_y = 80;

    //印章采样位置
    $stamp_area_x = 0;
    $stamp_area_y = 0;
    $stamp_area_w = $stamp_w;
    $stamp_area_h = $stamp_h;

    $pct = 25;
    //采样 拷贝 合并
    imagecopymerge($dst_image, $stamp_image, $dst_x, $dst_y, $stamp_area_x,$stamp_area_y , $stamp_area_w,$stamp_area_h , $pct); 

    header("content-type:image/jpeg");
    imagejpeg($dst_image);
    imagedestroy($dst_image);
    imagedestroy($stamp_image);