通过文件头判断文件类型

 

 

 

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通过文件头来判断文件类型   https://www.garykessler.net/library/file_sigs.html   https://en.wikipedia.org/wiki/List_of_file_signatures   https://gist.github.com/Qti3e/6341245314bf3513abb080677cd1c93b   https://gist.github.com/k1ic/ad805d5e3ee9931bea2c   https://gist.github.com/ldong/f334b9dcd421c99e094d   https://gist.github.com/soasme/6085733       php文件格式(mime类型)对照表 https://blog.csdn.net/q343509740/article/details/79616603   1.  mime_content_type返回指定文件的MIME类型，用法：   echo mime_content_type ( 'php.gif' ) . "\n" ; echo mime_content_type ( 'test.php' );   2.  Fileinfo 获取文件MIME类型(finfo_open)   PHP官方推荐mime_content_type()的替代函数是Fileinfo函数。用法：   $finfo = finfo_open(FILEINFO_MIME); $mimetype = finfo_file($finfo, $filename); finfo_close($finfo);   function getTypeList(){     return array(         "jpg"  =>    "FFD8FFE1",         "png"  =>    "89504E47",         "gif"  =>    "47494638",         "tif"  =>    "49492A00",         "bmp"  =>    "424D",         "dwg"  =>    "41433130",         "psd"  =>    "38425053",         "rtf"  =>    "7B5C727466",         "xml"  =>    "3C3F786D6C",         "html  =>    "68746D6C3E",         "eml"  =>    "44656C69766572792D646174",         "dbx"  =>    "CFAD12FEC5FD746F",         "pst"  =>    "2142444E",         "xls"  =>    "D0CF11E0",         "doc"  =>    "D0CF11E0",         "mdb"  =>    "5374616E64617264204A",         "wpd"  =>    "FF575043",         "eps"  =>    "252150532D41646F6265",         "ps"   =>    "252150532D41646F6265",         "pdf"  =>    "255044462D312E",         "pwl"  =>    "E3828596",         "zip"  =>    "504B0304",         "rar"  =>    "52617221",         "wav"  =>    "57415645",         "avi"  =>    "41564920",         "ram"  =>    "2E7261FD",         "rm"   =>    "2E524D46",         "mpg"  =>    "000001BA",         "mpg"  =>    "000001B3",         "mov"  =>    "6D6F6F76",         "asf"  =>    "3026B2758E66CF11",         "mid"  =>    "4D546864",         ) }     /**  * 获取文件类型（通过读取文件前两个字节判断文件类型）  * @param string $path 文件绝对路径  * @return string 文件扩展名  */ function get_file_type( $path = '' ) {     $res = '';     if ( file_exists($path) && is_readable($path) ) {         $fh = fopen($path, 'rb');         $bin = fread($fh, 2); //不一定只读前两个字节, 各个不同文件类型，头信息不一样。         fclose($fh);           $str_info  = unpack('C2chars', $bin); //"C2chars"中的“C”表示将给定二进制字符串解包为无符号字节型         $type_code = intval($str_info['chars1'] . $str_info['chars2']);         switch ( $type_code ) {             case 3533:                 $res = 'amr';                 break;             case 6677:                 $res = 'bmp';                 break;             case 7790:                 $res = 'exe';                 break;                 break;             case 7173:                 $res = 'gif';                 break;             case 255216:                 $res = 'jpg';                 break;             case 7368:                 $res = 'mp3';                 break;             case 6063:                 $res = 'php';                 break;             case 13780:                 $res = 'png';                 break;             case 8297:                 $res = 'rar';                 break;             case 4950:                 $res = 'txt';                 break;             case 8075:                 $res = 'zip';                 break;             default:                 $res = 'unknown' . $type_code;         }     } else {         $res = !file_exists($path) ? 'file not exists' : ( !is_readable($path) ? 'not a readable file' : '' );     }     return $res; }