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How to determine whether a gif image is animated in php?

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Release： 2016-07-25 08:52:57
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  2. {
  3. $fp=fopen($filename, 'rb'); $filecontent=fread($fp, filesize($filename));
  4. fclose($fp);
  5. return strpos($filecontent,chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0')===FALSE?0:1;
  6. } // bbs.it-home.org
  7. echo IsAnimatedGif("zzsky.gif");
  8. ?>
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php怎么判断gif图片是否为动画？
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