Zápis z formulára do css súboru

<?
if ($_POST[submit])
 {
 if($farbapozadia==""){
 echo "nezadali ste farbu pozadia<br>";}
  if($color==""){
 echo "nezadali ste farbu pisma";}
 }
 if($farbapozadia and $color){
 echo "yapis sa ulo6il";
$farbapozadia = $_POST["farbapozadia"];
$tohle_je_muj_styl = "body {background-color: ".$farbapozadia."}.nadpis {color: ".$color."}";
file_put_contents("style.css", $tohle_je_muj_styl);}
$pole=file("style.css");
for($i=0;$i<count($pole);$i++){
if($pole=="background-color"){echo "je tam";
echo $pole[$i];}
}


?>
<form method="post" action="" > 
<table> 
<tr> 
<td>farba pozadia:</td> 
<td><input type="text" name="farbapozadia" ></td> 
</tr> 
<td>farbapisma</td> 
<td><input type="text" name="color" ></td> 
</tr> 
</table> 
<br> 
<input type="submit" name="submit" value="Uložit novinku"> 
 
</form>