php检测文件类型,根据文件header信息
文章提供一款php检测文件类型,根据文件header信息,他可以根据用户发布的文件头部信息来确实文件的类型,代码如下:
<?php /*通过文件名，获得文件类型* *@author chengmo* *@copyright cnblog测试数据/chengmo 2010-10-17 *@version 0.1 *$filename="d:/1.png";echo cfiletypecheck::getfiletype($filename); 打印：png */ class cfiletypecheck { private static $_typelist = array (); private static $checkclass =null; private function __construct( $filename ) { self:: $_typelist = $this ->gettypelist(); } /** *处理文件类型映射关系表* * * @param string $filename 文件类型 * @return string 文件类型，没有找到返回：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); //只读15字节 各个不同文件类型，头信息不一样。 fclose( $file ); $typelist =self:: $_typelist ; foreach ( $typelist as $v ) { $blen = strlen (pack( "h*" , $v [0])); //得到文件头标记字节数 $tbin = substr ( $bin ,0, intval ( $blen )); ///需要比较文件头长度 if ( strtolower ( $v [0])== strtolower ( array_shift (unpack( "h*" , $tbin )))) { return $v [1]; } } return $filetype ; } /** *得到文件头与文件类型映射表* * * @return array array(array('key',value)...) */ public function gettypelist() { return array ( array ( "ffd8ffe1" , "jpg" ), array ( "89504e47" , "png" ), array ( "47494638" , "gif" ), array ( "49492a00" , "tif" ), array ( "424d" , "bmp" ), array ( "41433130" , "dwg" ), array ( "38425053" , "ps教程d" ), array ( "7b5c727466" , "rtf" ), array ( "3c3f786d6c" , "xml" ), array ( "68746d6c3e" , "html" ), array ( "44656c69766572792d646174" , "eml" ), array ( "cfad12fec5fd746f" , "dbx" ), array ( "2142444e" , "pst" ), array ( "d0cf11e0" , "xls/doc" ), array ( "5374616e64617264204a" , "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 ( "2e7261fd" , "ram" ), array ( "2e524d46" , "rm" ), array ( "000001ba" , "mpg" ), array ( "000001b3" , "mpg" ), array ( "6d6f6f76" , "mov" ), array ( "3026b2758e66cf11" , "asf" ), array ( "4d546864" , "mid" )); } //开源代码phpfensi测试数据 public static function getfiletype( $filename ) { if (!self:: $checkclass ) self:: $checkclass = new self( $filename ); $class =self:: $checkclass ; return $class ->_getfiletype( $filename ); } } ?>查看更多关于php检测文件类型,根据文件header信息 - php高级应用的详细内容...
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