为什么显示图片，但不显示文字

源自：2-4 给图片添加文字水印—保存和销毁图片

<?php

$src = '02.jpg';

$info = getimagesize($src);

$type = image_type_to_extension($info[2],false);

$fun = "imagecreatefrom{$type}";

$image = $fun($src);

$font = "simhei.ttf";

$content = "你好，美女";

$color = imagecolorallocatealpha($image,255,0,0,50);

imagettftext($image,20,0,20,30,$color,$font,$content);

header("Content-type:".$info['mime']);

$func = "image{$type}";

$func($image);

imagedestroy($image);

提问者：wangping1985 2015-02-22 01:23