PHP to judge upload file type solution _php tips

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/** * Read the first few bytes of the file to determine the file type * @return String/function Checktitle ($filename) {$file =fopen ($fi 
  Lename, "RB"); $bin =fread ($file, 2); 
  Read Only 2 bytes fclose ($file); 
  $strInfo = @unpack ("C2chars", $bin); 
  $typeCode =intval ($strInfo [' chars1 ']. $strInfo [' chars2 ']); 
  $fileType = '; 
    Switch ($typeCode) {case 7790: $fileType = ' exe '; 
    Break 
    Case 7784: $fileType = ' midi '; 
    Break 
    Case 8297: $fileType = ' rar '; 
    Break 
    Case 255216: $fileType = ' jpg '; 
    Break 
    Case 7173: $fileType = ' gif '; 
    Break 
    Case 6677: $fileType = ' bmp '; 
    Break 
    Case 13780: $fileType = ' png '; 
    Break 
    Default: $fileType = ' unknown '. $typeCode; 
  Break 
  //fix if ($strInfo [' chars1 ']== '-1 ' && $strInfo [' chars2 ']== ' -40 ') {return ' JPG '; 
  } if ($strInfo [' chars1 ']== ' -119 ' && $strInfo [' chars2 ']== ') {return ' PNG '; 
return $fileType; } 

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