通过文件前几个字节判断文件类型
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2022-03-16 18:27:28
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[PHP]代码
function file_type($filename){ $file = fopen($filename, "rb"); $bin = fread($file, 4); fclose($file); $strInfo = @unpack("H*chars", $bin); $typeCode = $strInfo['chars']; $typeCode = strtoupper($typeCode); $hex_3 = substr($typeCode,0,6); $hex_4 = substr($typeCode,0,8); $fileType = ''; switch ($hex_3) { case 'FFD8FF': $fileType = 'jpg'; break; } if(!empty($fileType)){ return $fileType; } switch ($hex_4) { case '89504E47': $fileType = 'png'; break; case '47494638': $fileType = 'gif'; break; case '00000018': $fileType = 'arm'; break; case '2321414D': $fileType = 'amr'; break; default: $fileType = 'unknown: '.$typeCode; } return $fileType; }
[PHP]代码
JPEG (jpg),文件头:FFD8FF PNG (png),文件头:89504E47 GIF (gif),文件头:47494638 TIFF (tif),文件头:49492A00 Windows Bitmap (bmp),文件头:424D CAD (dwg),文件头:41433130 Adobe Photoshop (psd),文件头:38425053 Rich Text Format (rtf),文件头:7B5C727466 XML (xml),文件头:3C3F786D6C HTML (html),文件头:68746D6C3E Email [thorough only] (eml),文件头:44656C69766572792D646174653A Outlook Express (dbx),文件头:CFAD12FEC5FD746F Outlook (pst),文件头:2142444E MS Word/Excel (xls.or.doc),文件头:D0CF11E0 MS Access (mdb),文件头:5374616E64617264204A WordPerfect (wpd),文件头:FF575043 Postscript (eps.or.ps),文件头:252150532D41646F6265 Adobe Acrobat (pdf),文件头:255044462D312E Quicken (qdf),文件头:AC9EBD8F Windows Password (pwl),文件头:E3828596 ZIP Archive (zip),文件头:504B0304 RAR Archive (rar),文件头:52617221 Wave (wav),文件头:57415645 AVI (avi),文件头:41564920 Real Audio (ram),文件头:2E7261FD Real Media (rm),文件头:2E524D46 MPEG (mpg),文件头:000001BA MPEG (mpg),文件头:000001B3 Quicktime (mov),文件头:6D6F6F76 Windows Media (asf),文件头:3026B2758E66CF11 MIDI (mid),文件头:4D546864
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