SOLVED :Why am I having “Fatal error: Uncaught Exception: String could not be parsed as XML”?

Question

I am trying to get data from my API to the main page but it keeps giving me this error:

Warning: file_get_contents(http://localhost/PaimentElec/server/apiDetails.php?xml=<movie><id>2</id></movie> ): failed to open stream: HTTP request failed! HTTP/1.1 400 Bad Request in C:\xampp\htdocs\PaimentElec\client\rep.php on line 19
**Fatal error**: Uncaught Exception: String could not be parsed as XML in C:\xampp\htdocs\PaimentElec\client\rep.php:20 Stack trace: #0 C:\xampp\htdocs\PaimentElec\client\rep.php(20): SimpleXMLElement->__construct('') #1 {main} thrown in C:\xampp\htdocs\PaimentElec\client\rep.php on line 20 

At first I thought maybe I have errors in my API XML, so I used https://www.w3schools.com/xml/xml_validator.asp to double check and it said that my code is fine. When I open the link for the API (eg http://localhost/PaimentElec/server/apiDetails.php?xml=<movie><id>2</id></movie> ) it shows the data perfectly.

This is the API:

<?xml version="1.0"  encoding="UTF-8"?>
<movies>
<?php
$db = new PDO("mysql:host=localhost;dbname=homecinema","root","");
    $xml=$_GET["xml"];
    $retour= new SimpleXMLElement($xml);
    $id=$retour->id;
    $retour=$db->query("select * from movie where id='$id' ");
    $movies=$retour->fetchAll(); 
    foreach($movies as $movie){
    ?>
      <movie>
      <title> <?php echo $movie ["title"];?></title>
      </movie>
<?php   
}?>
</movies>

and this is where I called the API (page name rep.php):

$id=$_POST["id"];    //this is the line 19
$xmlrq="<movie><id>$id</id></movie>";
$xml=file_get_contents("http://localhost/PaimentElec/server/apiDetails.php?xml=$xmlrq");
$retour= new SimpleXMLElement($xml);

PS: the id was sent by another page:

<form method="POST" action="rep.php">
    <input type="hidden" name="id" value="<?php echo $movie->id; ?>">
</form>

Answer 1

The string which you receive is not valid xml. here you can check for correct standard of XML https://www.w3schools.com/xml/schema_intro.asp , but I suggest you to forget for xml (if it's possible) because XML is old and not best solution, for web you can use JSON.