מישהו יכול להגיד לי מה הפונקציה ליצור קובץ על שרת

נגיד יש לי דבר כזה

<?
$username = $_POST['username'];
?>

אז אני צריך פונצקיה שתיצור לי קובץ

$username.something

עם תוכן שאני יקבע..

תודה

<?php
$filename = 'test.txt';
$somecontent = "Add this to the file\n";

// Let's make sure the file exists and is writable first.
if (is_writable($filename)) {

  // In our example we're opening $filename in append mode.
  // The file pointer is at the bottom of the file hence
  // that's where $somecontent will go when we fwrite() it.
  if (!$handle = fopen($filename, 'a')) {
     echo "Cannot open file ($filename)";
     exit;
  }

  // Write $somecontent to our opened file.
  if (fwrite($handle, $somecontent) === FALSE) {
    echo "Cannot write to file ($filename)";
    exit;
  }

  echo "Success, wrote ($somecontent) to file ($filename)";

  fclose($handle);

} else {
  echo "The file $filename is not writable";
}
?> 

http://il.php.net/fwrite

<?php
$filename = 'test.txt';
$somecontent = "Add this to the file\n";

// Let's make sure the file exists and is writable first.
if (is_writable($filename)) {

  // In our example we're opening $filename in append mode.
  // The file pointer is at the bottom of the file hence
  // that's where $somecontent will go when we fwrite() it.
  if (!$handle = fopen($filename, 'a')) {
     echo "Cannot open file ($filename)";
     exit;
  }

  // Write $somecontent to our opened file.
  if (fwrite($handle, $somecontent) === FALSE) {
    echo "Cannot write to file ($filename)";
    exit;
  }

  echo "Success, wrote ($somecontent) to file ($filename)";

  fclose($handle);

} else {
  echo "The file $filename is not writable";
}
?> 

http://il.php.net/fwrite

תודה 8)