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

WBOYOriginal: 2016-07-25 08:52:571287browse

{
$fp=fopen($filename, 'rb'); $filecontent=fread($fp, filesize($filename));
fclose($fp);
return strpos($filecontent,chr(0x21).chr(0xff).chr(0x0b).'NETSCAPE2.0')===FALSE?0:1;
} // bbs.it-home.org
echo IsAnimatedGif("zzsky.gif");
?>

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

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