echo $_SERVER['HTTP_REFERER']; 

$Refrerer = $_SERVER['HTTP_REFERER']; 
 
echo $Refrerer; 

<?php 
$datei = 'referer.txt'; 
$fp = fopen($datei, "a"){ // a = Apennd (Anhängen) 
   if($fp){ 
        fputs($fp, $_SERVER['HTTP_REFERER']."\n"); 
     } 
  fclose($fp); 
?> 

<?php 
$datei = 'referer.txt'; 
if (file_exists($datei)){ 
$db = fopen($datei, "r"); 
$altes = @fread($db, filesize($datei)); 
	$fp = fopen($datei, "w+"); 
fputs ($fp, $_SERVER['HTTP_REFERER']."\n".$altes);	 
	fclose($fp); 
	fclose($db); 
}else{ 
	$fp = fopen($datei, "w+"); 
	fputs ($fp, $_SERVER['HTTP_REFERER']."\n"); 
	fclose($fp); 
} 
?> 

<?php 
$datei = 'referer.txt'; 
$fp = fopen($datei, "r"){ // r = read (Lesen) 
   if($fp){ 
      while(!feop($fp){ 
      $zeile .= fgets($fp, 100); 
     } 
      fclose($fp); 
   } 
  echo $zeile; 
?>