submit.php

<form action="" method="post">
link : <textarea name="lin">http://</textarea><input type="submit"></form>




<?php

$link = $_POST["lin"];

if($link != null){
$f = fopen("link.txt", "w+");
 fwrite($f, $link);
fclose($f);

echo "<script>window.location = 'gei.php'</script>";
}
?>