<?php
/*保存图片*/
$src="001.jpg";
$info=getimagesize($src);
$type=image_type_to_extension($info[2],false);
print_r($info);
$fun="imagecreatefrom{$type}";
$image=$fun($src);

$font="msyh.ttf";
$content="你好，慕课";

$col=imagecolorallocatealpha($image,255,255,255,50);
imagettftext($image,20,0,20,30,$col,$font,$content);

header("Content-type: " . $info['mime']);
$func="image{$type}";
$func($image);

$func($image,'newimage.'.$type);

imagedestroy($image);

?>