PHP로 워터마크 만들기

<?php/**
 * 为图片添加文字水印
 * @param  string $dst_path    原图路径
 * @param  string $font_path   字体存放路径
 * @param  string $string_font 欲添加的文字
 */function textwatermark($dst_path,$font_path,$string_font){
    //创建图片的实例
    $dst = imagecreatefromstring(file_get_contents($dst_path));    //添加文字
    $black = imagecolorallocate($dst, 0x00, 0x00, 0x00);
    imagefilledrectangle($dst, 0, 0, 79, 49, 0x0000FF);
    imagefilledrectangle($dst, 9, 9, 70, 40, 0xFFFFFF);
    imagefttext($dst, 13, 0, 20, 20, $black, $font_path, $string_font);    //输出图片
    list($dst_w, $dst_h, $dst_type) = getimagesize($dst_path);    switch ($dst_type) {        case 1://IMAGETYPE_GIF
            header(&#39;Content-Type: image/gif&#39;);
            imagegif($dst);            break;        case 2://IMAGETYPE_JPEG
            header(&#39;Content-Type: image/jpeg&#39;);
            imagejpeg($dst);            break;        case 3://IMAGETYPE_PNG
            header(&#39;Content-Type: image/png&#39;);
            imagepng($dst);            break;        default:            break;
    }
    imagedestroy($dst);
}
header(&#39;charset=utf-8&#39;);$dst_path = &#39;./uploads/1.jpg&#39;;//选择的字体需支持中文 arial.ttf不支持中文$font_path = &#39;C:/Windows/Fonts/simhei.ttf&#39;;        
//当文件编码为utf-8时 不需转换 $string_font = &#39;剑liang&#39;;       
textwatermark($dst_path,$font_path,$string_font);?>