Powerful php Check file type _php tutorial

A powerful file type detection function, it can determine what type of file you upload, this you have no way to install the past, the need for friends can refer to.

The code is as follows

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** * * * @access Public * @param string filename * @param string limit_ext_types allowed file types, with | enclosing types such as: |gif|txt| * @return String */ function Check_file_type ($filename, $limit _ext_types = ") { $extname = Strtolower (substr ($filename, Strrpos ($filename, '. ') + 1)); if ($limit _ext_types && Stristr ($limit _ext_types, ' | '. $extname. '|') = = = False) { Return '; } $str = $format = "; $file = @fopen ($filename, ' RB '); if ($file) { $str = @fread ($file, 0x400); Read the first 1024 bytes @fclose ($file); } else{ $format = $extname; } if ($format = = "&& strlen ($STR) >= 2) { if (substr ($str, 0, 4) = = ' MThd ' && $extname! = ' txt ') { $format = ' mid '; } ElseIf (substr ($str, 0, 4) = = ' RIFF ' && $extname = = ' wav ') { $format = ' wav '; } ElseIf (substr ($str, 0, 3) = = "Xffxd8xff") { $format = ' jpg '; } ElseIf (substr ($str, 0, 4) = = ' GIF8 ' && $extname! = ' txt ') { $format = ' gif '; } ElseIf (substr ($str, 0, 8) = = "x89x50x4ex47x0dx0ax1ax0a") { $format = ' png '; } ElseIf (substr ($str, 0, 2) = = ' BM ' && $extname! = ' txt ') { $format = ' bmp '; } ElseIf ((substr ($str, 0, 3) = = ' CWS ' | | substr ($STR, 0, 3) = = ' FWS ') && $extname! = ' txt ') { $format = ' swf '; } ElseIf (substr ($str, 0, 4) = = "Xd0xcfx11xe0") {//d0cf11e = = Docfile = Microsoft Office Document if (substr ($str, 0x200,4) = = "Xecxa5xc1x00" || $extname = = ' Doc ') { $format = ' Doc '; } ElseIf (substr ($str, 0x200,2) = = "X09x08" | | $extname = = ' xls ') { $format = ' xls '; } ElseIf (substr ($str, 0x200,4) = = "Xfdxffxffxff" || $extname = = ' ppt ') { $format = ' ppt '; } } ElseIf (substr ($str, 0, 4) = = "pkx03x04") { $format = ' zip '; } ElseIf (substr ($str, 0, 4) = = ' rar! ' && $extname! = ' txt ') { $format = ' rar '; } ElseIf (substr ($str, 0, 4) = = "X25pdf") { $format = ' pdf '; } ElseIf (substr ($str, 0, 3) = = "x30x82x0a") { $format = ' cert '; } ElseIf (substr ($str, 0, 4) = = ' ITSF ' && $extname! = ' txt ') { $format = ' chm '; } ElseIf (substr ($str, 0, 4) = = "X2ERMF") { $format = ' RM '; } ElseIf ($extname = = ' sql ') { $format = ' sql '; } ElseIf ($extname = = ' txt ') { $format = ' txt '; } } if ($limit _ext_types && Stristr ($limit _ext_types, ' | '. $format. '|') = = = False) { $format = "; } return $format; }

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