CODEWITHSUNDEEP
phpxmlsimplexml
Yannick Mackor
Yannick Mackor

Reputation: 84

How do I add children to a newly created XML node using PHP

I am trying to add children to a newly created node using addChild() of simpleXml but it gives me an exception:

Warning: SimpleXMLElement::addChild()[simlexmlelement.addchild]: Cannot add child. Parent is not a permanent member of the XML tree in (file address) on line (line number)

And I got that multiple times, since the significant part of my code is:

<?php

  $xml = simplexml_load_file(".db.xml") or die("Sorry, no database file found, we will solve it as soon as possible.");

  if($xml->$name->getName() == $name) {
    echo "We're sorry, but this account name already exists. Underneath is a table with your signup data anyways. We also sent you an email if you are going to retry later.";
  } else {
    $xml->db->addChild($name);
    $xml->$name->addChild("email", $email);
    $xml->$name->addChild("day", $day);
    $xml->$name->addChild("month", $month);
    $xml->$name->addChild("year", $year);
  }
?>

And this is my prettified XML code:

<?xml version="1.0" encoding="UTF-8"?>
<body>
  <db>
    <example>
      <email>[email protected]</email>
      <day>01</day>
      <month>01</month>
      <year>1975</year>
    </example>
  </db>
</body>

What am I doing wrong here?

Note:

I know that the values of the variables are not the problem because all variables show the right values in the table of data that I made for the page.

Upvotes: 0

Views: 671

Answers (1)

Paul G Mihai
Paul G Mihai

Reputation: 227

You should add the children to a reference like so:

$nametag = $xml->db->addChild($name);
$nametag->addChild("email", $email);
$nametag->addChild("day", $day);
$nametag->addChild("month", $month);
$nametag->addChild("year", $year);

Read more here: http://php.net/manual/ro/simplexmlelement.addchild.php

example nr.1

Update

Here the code I tested with output so you can see it actually adds the tags to the final xml structure:

$xml = simplexml_load_file("db.xml") or die("Sorry, no database file found, we will solve it as soon as possible.");
$name = "a";
$email = "b";
$day = "c";
$month = "d";
$year = "e";
if($xml->$name->getName() == $name) {
    echo "We're sorry, but this account name already exists. Underneath is a table with your signup data anyways. We also sent you an email if you are going to retry later.";
} else {
    $tagname = $xml->db->addChild($name);
    $tagname->addChild("email", $email);
    $tagname->addChild("day", $day);
    $tagname->addChild("month", $month);
    $tagname->addChild("year", $year);
}
var_dump($xml->asXML());

Update 2

To save the xml to a file add at the end:

$xml->asXML("db.xml"); // this would overwrite your old file

Check this out here: http://php.net/manual/en/simplexmlelement.asxml.php

Upvotes: 1

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