以下为引用的内容: <?php /*通过文件名,获得文件类型* *@author chengmo* *@copyright cnblog.com/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 $filetype; } /** *得到文件头与文件类型映射表* * * @return array array(array('key',value)...) */ public function getTypeList() { return array(array("FFD8FFE1","jpg"), array("89504E47","png"), array("47494638","gif"), array("49492A00","tif"), array("424D","bmp"), array("41433130","dwg"), array("38425053","psd"), array("7B5C727466","rtf"), array("3C3F786D6C","xml"), array("68746D6C3E","html"), array("44656C69766572792D646174","eml"), array("CFAD12FEC5FD746F","dbx"), array("2142444E","pst"), array("D0CF11E0","xls/doc"), array("5374616E64617264204A","mdb"), array("FF575043","wpd"), array("252150532D41646F6265","eps/ps"), array("255044462D312E","pdf"), array("E3828596","pwl"), array("504B0304","zip"), array("52617221","rar"), array("57415645","wav"), array("41564920","avi"), array("2E7261FD","ram"), array("2E524D46","rm"), array("000001BA","mpg"), array("000001B3","mpg"), array("6D6F6F76","mov"), array("3026B2758E66CF11","asf"), array("4D546864","mid")); } public static function getFileType($filename) { if(!self::$CheckClass) self::$CheckClass=new self($filename); $class=self::$CheckClass; return $class->_getFileType($filename); } }
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