PHP - using a loop with fwrite - php

Question

I have a dynamic form that generates a xml file. The user can add add as many as they want. When the user clicks submit to generate the file, all entries should be written to the xml file.
Unfortunately right now, only the last entry is getting written. I know i need a loop statement but I've having issues.
Here's the form.php --> https://jsfiddle.net/jdarville/mbfjmd02/9/
And here's the save.php(i only included the important parts):
<?php
if(isset($_POST['submit'])){
$message0 = '<?xml version="1.0" encoding="UTF-8"?>';
foreach($_POST['howmany'] as $item_number){
$item_number = $item_number;
}
for($x=1;$x<=$item_number;$x++){
//echo $_POST["templateid".$x];
$message2 = '<Template tid="'. $_POST["templateid".$x].'" gid="000">
<OriginalKey>Queues/Scan</OriginalKey>
<Params>
}
for($x=1;$x<=$item_number;$x++){
$message2 = '</FileFormatInformation>
<StorePath>'. $_POST["uncpath".$x].'</StorePath>
<UserName>'.$_POST["username".$x].'</UserName>
<Password>'.$_POST["password".$x].'</Password>
</SMBStoreParameter>
<caption2>'.$_POST["scantoname".$x].'</caption2>
<userName />
}
}
$file = fopen("test.xml","w");
echo fwrite($file,"$message0 $message1 $message2 ");
fclose($file);
?>

Answer 1

Looks like $message2 = needs to be $message2 .= (that's dot equals)

Answer 2

<?php
if (isset($_POST['submit']))
{
$message0 = '<?xml version="1.0" encoding="UTF-8"?>';
$item_number = intval($_POST['howmany']);
for ($x = 1; $x <= $item_number; $x++)
{
$message1.= '<Template tid="' . $_POST["templateid" . $x] . '" gid="000"> <OriginalKey>Queues/Scan</OriginalKey> <Params>';
}
for ($x = 1; $x <= $item_number; $x++)
{
$message2.= '</FileFormatInformation> <StorePath>' . $_POST["uncpath" . $x] . '</StorePath> <UserName>' . $_POST["username" . $x] . '</UserName> <Password>' . $_POST["password" . $x] . '</Password></SMBStoreParameter><caption2>' . $_POST["scantoname" . $x] . '</caption2><userName />';
}
$file = fopen("test.xml", "w");
echo fwrite($file, "$message0 $message1 $message2 ");
fclose($file);
}
?>
Your xml is not valid because some tags have not been closed and some have not been opened below are some invalid xml tags.
<Params> has not been closed.
</FileFormatInformation> has not been opened.