用PHP判断一个gif图片是不是动画(多帧)
<?php function IsAnimatedGif($filename) { $fp = fopen($filename, 'rb'); $filecontent = fread($fp, filesize($filename)); fclose($fp); return strpos($filecontent,chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0') === FALSE?0:1; } echo IsAnimatedGif("51windows.gif"); ?>