Description:
------------
fwrite() prepends '\' if is there any '," or \ . PHP tries to write a '\' for every inclusion of the above characters.

Reproduce code:
---------------
<form name="frmFile" method="post" action="test.php">
<textarea name="txtFile" rows=5>
<?= $_POST['txtFile']; ?>
</textarea>
<input type = submit value="Test" > 
</form>

<?php
 if(isset($_POST['txtFile'])){
  $data = $_POST['txtFile'];
  fwrite($fp, $data);
  fclose ($fp);
 }
?>

Expected result:
----------------
i expect to remove the extra slash('\') and get the file as what i write in the text area.

Actual result:
--------------
this is \\\\\\\'\\\\\\\'  test \\\\\\\\