Php code for file type detection based on file header information

Php code for file type detection based on file header information

// Check the file type Function checkFileType ($ fileName ){ $ File = fopen ($ fileName, "rb "); $ Bin = fread ($ file, 2); // read-only 2 bytes Fclose ($ file ); // C is an unsigned integer, and all found on the Internet are c, which is a signed integer, resulting in negative numbers and incorrect judgment. $ StrInfo = @ unpack ("C2chars", $ bin ); $ TypeCode = intval ($ strInfo ['chars1']. $ strInfo ['chars2']); $ FileType = ''; Switch ($ typeCode) { Case '20140901 ': Return $ typeCode. ':'. 'jpg '; Break; Case '20140901 ': Return $ typeCode. ':'. 'GIF '; Break; Case '20140901 ': Return $ typeCode. ':'. 'PNG '; Break; Case '20140901 ': Return $ typeCode. ':'. 'bmp '; Break; Case '20140901 ': Return $ typeCode. ':'. 'exe '; Break; Case '20140901 ': Return $ typeCode. ':'. 'midi '; Break; Case '20140901 ': Return $ typeCode. ':'. 'rar '; Break; Default: Return $ typeCode. ':'. 'unknown '; Break; } // Return $ typeCode; } $ File_name = '11.doc '; Echo checkFileType ($ file_name ); ?> 2. verify the class of the file type based on the php file header information /* Obtain the file type by file name * * $ Filename = "d:/1.png"; echo cFileTypeCheck: getFileType ($ filename); print: png */ Class cFileTypeCheck { Private static $ _ TypeList = array (); Private static $ CheckClass = null; Private function _ construct ($ filename) { Self: $ _ TypeList = $ this-> getTypeList (); } /** * Process the file type ing table * * * @ Param string $ filename File type * @ Return string file type. the returned value is other. */ Private function _ getFileType ($ filename) { $ Filetype = "other "; If (! File_exists ($ filename) throw new Exception ("no found file! "); $ File = @ fopen ($ filename, "rb "); If (! $ File) throw new Exception ("file refuse! "); $ Bin = fread ($ file, 15); // read-only 15 bytes for different file types and different header information. Fclose ($ file ); $ Typelist = self ::$ _ TypeList; Foreach ($ typelist as $ v) { $ Blen = strlen (pack ("H *", $ v [0]); // get the number of bytes marked by the file header $ Tbin = substr ($ bin, 0, intval ($ blen); // compare the file header length If (strtolower ($ v [0]) = strtolower (array_shift (unpack ("H *", $ tbin )))) { Return $ v [1]; } } Return $ filetype; } /** * Get the file header and file type ing table * * * @ Return array ('key', value )...) */ Public function getTypeList () { Return array ("FFD8FFE1", "jpg "), Array ("89504E47", "png "), Array ("47494638", "gif "), Array ("49347a00", "tif "), Array ("mongod", "bmp "), Array ("41433130", "dwg "), Array ("38425053", "psd "), Array ("7B5C727466", "rtf "), Array ("3C3F786D6C", "xml "), Array ("68746D6C3E", "html "), Array ("44656C69766572792D646174", "eml "), Array ("CFAD12FEC5FD746F", "dbx "), Array ("2142444E", "pst "), Array ("D0CF11E0", "xls/doc "), Array ("5374616e64617213204a", "mdb "), Array ("FF575043", "wpd "), Array ("252150532D41646F6265", "eps/ps "), Array ("255044462D312E", "pdf "), Array ("E3828596", "pwl "), Array ("504B0304", "zip "), Array ("52617221", "rar "), Array ("57415645", "wav "), Array ("41564920", "avi "), Array ("2e00001fd", "ram "), Array ("2E524D46", "rm "), Array ("000001BA", "mpg "), Array ("000001B3", "mpg "), Array ("6D6F6F76", "mov "), Array ("3026B2758E66CF11", "asf "), Array ("4D546864", "mid ")); } Public static function getFileType ($ filename) { If (! Self: $ CheckClass) self: $ CheckClass = new self ($ filename ); $ Class = self: $ CheckClass; Return $ class-> _ getFileType ($ filename ); } } $ Filename = "22.jpg "; Echo $ filename, "t", cFileTypeCheck: getFileType ($ filename), "rn "; $ Filename = "11.doc "; Echo $ filename, "t", cFileTypeCheck: getFileType ($ filename), "rn "; // This can also be detected $ Filename = '22.jpg '; $ Extname = strtolower (substr ($ filename, strrpos ($ filename, '.') + 1 )); Echo $ extname .' '; $ File = @ fopen ($ filename, 'RB '); If ($ file) { $ Str = @ fread ($ file, 0x400); // read the first 1024 bytes Echo substr ($ str, 0, 4 ); @ Fclose ($ file ); } If (substr ($ str, 0, 4) = 'mthd' & $ extname! = 'Txt ') { $ Format = 'mid '; } Elseif (substr ($ str, 0, 4) = 'riff' & $ extname = 'wav ') { $ Format = 'wav '; } Elseif (substr ($ str, 0, 3) = "/xFF/xD8/xFF ") { $ Format = 'jpg '; } Elseif (substr ($ str, 0, 4) = 'gif 8' & $ extname! = 'Txt ') { $ Format = 'GIF '; } Elseif (substr ($ str, 0, 8) = "/x89/x50/x4E/x47/x0D/x0A/x1A/x0A ") { $ Format = 'PNG '; } Elseif (substr ($ str, 0, 2) = 'bm '& $ extname! = 'Txt ') { $ Format = 'bmp '; } Elseif (substr ($ str, 0, 3) = 'done' | substr ($ str, 0, 3) = 'fws ') & $ extname! = 'Txt ') { $ Format = 'swf '; } Elseif (substr ($ str, 0, 4) = "/xD0/xCF/x11/xE0 ") {// D0CF11E = DOCFILE = Microsoft Office Document If (substr ($ str, 0x200,4) = "/xEC/xA5/xC1/x00" | $ extname = 'doc ') { $ Format = 'doc '; } Elseif (substr ($ str, 0 x, 2) = "/x09/x08" | $ extname = 'XLS ') { $ Format = 'XLS '; } Elseif (substr ($ str, 0 x, 4) = "/xFD/xFF" | $ extname = 'ppt ') { $ Format = 'ppt '; } } Elseif (substr ($ str, 0, 4) = "PK/x03/x04 ") { $ Format = 'Zip '; } Elseif (substr ($ str, 0, 4) = 'rar! '& $ Extname! = 'Txt ') { $ Format = 'rar '; } Elseif (substr ($ str, 0, 4) = "/x25PDF ") { $ Format = 'PDF '; } Elseif (substr ($ str, 0, 3) = "/x30/x82/x0A ") { $ Format = 'cert '; } Elseif (substr ($ str, 0, 4) = 'itsf '& $ extname! = 'Txt ') { $ Format = 'chm '; } Elseif (substr ($ str, 0, 4) = "/x2ERMF ") { $ Format = 'rm '; } Elseif ($ extname = 'SQL ') { $ Format = 'SQL '; } Elseif ($ extname = 'txt ') { $ Format = 'txt '; } Echo $ format; ?>