<?php 
		include "variable.php"; 
		 
			function writedatafile() { 
			 
		$filename ="Data/daten.txt"; 
		$dataInput="$Name; $Vorname; $Wohnort; $kunde; $EMail; \n"; 
		$file=fOpen($filename,"a"); 
		fWrite($file,$dataInput); 
		fClose ($file); 
			 
			} 
     ?> 

<?php 
include "variable.php";  
 
function writedatafile() { 
if (isset($Name) &&  
   isset($Vorname) &&  
   isset($Wohnort) &&  
   isset($kunde) &&  
   isset($EMail)){ 
   $filename ="Data/daten.txt";  
   $dataInput="$Name; $Vorname;  
   $Wohnort; $kunde; $EMail; \n";  
   $file=fOpen($filename,"a"); 
   fWrite($file,$dataInput);  
   fClose ($file);  
   } 
} 
?> 

$array['name']="Mustermann"; 
$array['vorname']="Manfred"; 
$array['wohnort']="Mannheim"; 
$array['kunde']=1; 
$array['email']="ich@du.de"; 
 
writedatafile($array); 

function writedatafile($daten) 
{ 
... 
$dataInput=$daten['name'].";".$daten['vorname'].";".$daten... 
}