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function checkFileType($fileName){
$file = fopen($fileName, "rb");
$bin = fread($file, 2); //Ö»¶Á2×Ö½Ú
fclose($file);
$strInfo = @unpack("C2chars", $bin);// CΪÎÞ·ûºÅÕûÊý£¬ÍøÉÏËѵ½µÄ¶¼ÊÇc£¬ÎªÓзûºÅÕûÊý£¬ÕâÑù»á²úÉú¸ºÊýÅжϲ»Õý³£
$typeCode = intval($strInfo['chars1'].$strInfo['chars2']);
$fileType = '';
if($typeCode == 255216 /*jpg*/ || $typeCode == 7173 /*gif*/ || $typeCode == 13780 /*png*/) {
return true;
}else{
return false;
}
}
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