hi,

unten der Code. Bei mp3 ohne ID3 Tag bin ich mir nicht ganz sicher, ob das hex pattern fffb oder fffa lautet, wer Lust hat, teste mal ... danke!!

  
<?php  
  
  
// Die Klasse ist leicht erweiterbar:  
// Methode definieren und in $TYPES eintragen, fertig  
class FileType{  
	// Associate type => methods  
	// Möglicherweise gibt es mehrere Funktionen zum Prüfen eines Types  
	private $TYPES = array(  
		'image/gif'          => array('gif'),  
		'image/x-bmp'        => array('bmp'),  
		'application/pdf'    => array('pdf'),  
		'image/x-png'        => array('png'),  
		'image/jpeg'         => array('jpeg'),  
		'application/msword' => array('word97'),  
		'audio/mp3'          => array('id3', 'fffb'),  
		'application/zip'    => array('zip'),  
		'application/x-gzip' => array('gzip'),  
	);  
  
	/* ~~~~~~~~~~~~~~~~~ associated callback methods ~~~~~~~~~~~~~~~~ */  
	private function gzip($type){  
		if(fread($this->FH,2) == pack("H*", '1f8b')) return $type;  
	}  
	private function zip($type){  
		if('PK' != fread($this->FH,2)) return;  
		$s = fread($this->FH,2);  
		if($s == pack("H*", '0304')) return $type;  
	}  
	private function fffb($type){  
		if(fread($this->FH,2) == pack("H*", 'fffb')) return $type;  
	}  
  
	private function id3($type){  
		if(fread($this->FH,3) == 'ID3') return $type;  
	}  
	private function word97($type){  
		if(pack("H*", 'D0Cf11E0A1B11AE10000') == fread($this->FH, 10)){  
			return $type;  
		}  
	}  
	private function jpeg($type){  
		if(fread($this->FH,2) == pack("H*", 'ffd8')) return $type;  
	}  
  
	private function png($type){  
		fseek($this->FH,1,0);  
		if(fread($this->FH,3) == 'PNG') return $type;  
	}  
  
	private function bmp($type){  
		if(fread($this->FH,2) == 'BM') return $type;  
	}  
  
	private function gif($type){  
		if(fread($this->FH,4) == 'GIF8') return $type;  
	}  
  
	private function pdf($type){  
		if(fread($this->FH,5) == '%PDF-') return $type;  
	}  
  
	/* ~~~~~~~~~~~~~~~~~ associated callback methods ~~~~~~~~~~~~~~~~ */  
  
	function __construct($file){  
		// Handle erstellen  
		if(! $this->FH = fopen($file, "r")){  
			throw new Exception("IO-Error: Unable to open File '$file'");  
		}  
	}  
  
	public function type(){  
		$default_type = 'application/octet-stream';  
		foreach($this->TYPES as $type => $methods){  
			// call associated methods  
			foreach($methods as $callback_method){  
				if(! method_exists($this, $callback_method)) return $default_type;  
				fseek($this->FH, 0, 0);  
				if($return_type = $this->$callback_method($type)){  
					return $return_type;  
				}  
			}  
		}  
		return $default_type;  
	}  
} // End class FileType  
  
try{  
	$ft = new FileType('d:/tmp/x.mp');  
	echo $ft->type();  
}  
catch(Exception $e){  
	echo $e->getMessage();  
}  
  
  
return;  
?>