<?php      $files = array(         'c:\1.jpg',         'c:\1.png',         'c:\1.gif',         'c:\1.rar',         'c:\1.zip',         'c:\1.exe',     );     foreach ($files AS $file) {         $fp = fopen($file, "rb");         $bin = fread($fp, 2); //只读2字节         fclose($fp);         $str_info  = @unpack("C2chars", $bin);         $type_code = intval($str_info['chars1'].$str_info['chars2']);         $file_type = '';         switch ($type_code) {             case 7790:                 $file_type = 'exe';                 break;             case 7784:                 $file_type = 'midi';                 break;             case 8075:                 $file_type = 'zip';                 break;             case 8297:                 $file_type = 'rar';                 break;             case 255216:                 $file_type = 'jpg';                 break;             case 7173:                 $file_type = 'gif';                 break;             case 6677:                 $file_type = 'bmp';                 break;             case 13780:                 $file_type = 'png';                 break;             default:                 $file_type = 'unknown';                 break;         }         echo $file , ' type: <b>', $file_type, '</b> code:<b>', $type_code, '</b><br />';     }