How to modify xml data using php - Part 2

Use the following code to update the submitted value from modify.php into xml:
<?php
function update_book_id($id, $filename = 'loaned.xml')
{
$data = simplexml_load_file($filename);
for($i = 0, $length = count($data->resource->book); $i < $length; $i++)
    {
    if($data->resource->book[$i]->ID == $id)
        {
       
        $btitle = $_POST['btitle'];        
        $bdate = $_POST['bdate'];
        $bookrentdate = $_POST['bookrentdate'];
        $booksid = $_POST['booksid'];
       
        $data->resource->book[$i]->title = $btitle;
        $data->resource->book[$i]->date = $bdate;
        $data->resource->book[$i]->retdate = $bookrentdate;
        $data->resource->book[$i]->SID = $booksid;
        break;
        }
    }
    file_put_contents($filename, $data->saveXML());
    //echo $deletingbook." Deleted !!!";
}
//SAMPLE USAGE
$updatingbook = $_POST['bid'];
echo $updatingbook;
update_book_id ($updatingbook);
header("Location:index.php");  
//delete_book_id('Book 1');
?>

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