PHP detection file type (based on file header information) _php tutorial

The article provides a PHP detection file type (according to the file header information) Oh, he can according to the user post file header information to the exact file type.

This article provides a PHP tutorial to detect the file type (based on the header information of the file) Oh, he can according to the user post file header information to the exact file type.

/* Get the file type by filename *
* @author chengmo*
* @copyright Cnblog.com/chengmo 2010-10-17
* @version 0.1
* $filename = "d:/1.png"; Echo Cfiletypecheck::getfiletype ($filename); Printing: PNG
*/
Class Cfiletypecheck
{
private static $_typelist=array ();
private static $checkclass =null;
Private function __construct ($filename)
{
self::$_typelist= $this->gettypelist ();
}
/**
* Process file Type mapping Relationship table *
*
* @param string $filename file type
* @return string file type, not found returned: other
*/
Private Function _getfiletype ($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); Read-only 15 bytes each different file type, header information is not the same.
Fclose ($file);
$typelist =self::$_typelist;
foreach ($typelist as $v)
{
$blen =strlen (Pack ("h*", $v [0]); Gets the number of file header tokens in bytes
$tbin =substr ($bin, 0,intval ($blen)); Need to compare file header lengths
if (Strtolower ($v [0]) ==strtolower (Array_shift (Unpack ("h*", $tbin))))
{
return $v [1];
}
}
return $filetype;
}
/**
* Get file header and File type mapping table *
*
* @return Array Array (' key ', value) ...)
*/
Public Function Gettypelist ()
{
return Array (Array ("Ffd8ffe1", "jpg"),
Array ("89504e47", "PNG"),
Array ("47494638", "gif"),
Array ("49492a00", "TIF"),
Array ("424d", "BMP"),
Array ("41433130", "DWG"),
Array ("38425053", "PS Tutorial D"),
Array ("7b5c727466", "RTF"),
Array ("3C3F786D6C", "xml"),
Array ("68746d6c3e", "html"),
Array ("44656c69766572792d646174", "eml"),
Array ("cfad12fec5fd746f", "dbx"),
Array ("2142444e", "PST"),
Array ("D0cf11e0", "Xls/doc"),
Array ("5374616e64617264204a", "MDB"),
Array ("ff575043", "WPD"),
Array ("252150532d41646f6265", "Eps/ps"),
Array ("255044462d312e", "PDF"),
Array ("e3828596", "PWL"),
Array ("504b0304", "zip"),
Array ("52617221", "rar"),
Array ("57415645", "wav"),
Array ("41564920", "avi"),
Array ("2E7261FD", "Ram"),
Array ("2e524d46", "rm"),
Array ("000001BA", "mpg"),
Array ("000001b3", "mpg"),
Array ("6d6f6f76", "mov"),
Array ("3026b2758e66cf11", "ASF"),
Array ("4d546864", "mid"));
}
public static function Getfiletype ($filename)
{
if (!self:: $checkclass) Self:: $checkclass =new self ($filename);
$class =self:: $checkclass;
Return $class->_getfiletype ($filename);
}
}

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