PHP XML DOM Parser

PHP XML DOM Parser Tutorial

In PHP XML DOM Parser allows you to load, read, modify, and create XML documents. It represents the XML as a tree structure in memory, giving full control over nodes, attributes, and elements.

Loading and Reading XML

<?php
// Create DOMDocument object
$doc = new DOMDocument();
$doc->load("users.xml"); // Load XML file

// Get all <user> elements
$users = $doc->getElementsByTagName("user");

foreach ($users as $user) {
$id = $user->getAttribute("id"); // Get attribute
$name = $user->getElementsByTagName("name")->item(0)->nodeValue;
$email = $user->getElementsByTagName("email")->item(0)->nodeValue;

echo "ID: $id - Name: $name - Email: $email<br>";
}
?>

<?php

// Create DOMDocument object

$doc = new DOMDocument();

$doc->load("users.xml"); // Load XML file

// Get all <user> elements

$users = $doc->getElementsByTagName("user");

foreach ($users as $user) {

$id = $user->getAttribute("id"); // Get attribute

$name = $user->getElementsByTagName("name")->item(0)->nodeValue;

$email = $user->getElementsByTagName("email")->item(0)->nodeValue;

echo "ID: $id - Name: $name - Email: $email<br>";

}

Sample XML (users.xml):

Access elements with getElementsByTagName() and attributes with getAttribute().

Creating a New XML Document

<?php
// Create new DOMDocument
$doc = new DOMDocument("1.0", "UTF-8");

// Create root element
$root = $doc->createElement("users");
$doc->appendChild($root);

// Create a new <user> element
$user = $doc->createElement("user");
$user->setAttribute("id", "3");

// Add child elements
$name = $doc->createElement("name", "Ravi");
$email = $doc->createElement("email", "ravi@example.com");

$user->appendChild($name);
$user->appendChild($email);
$root->appendChild($user);

// Save XML to file
$doc->save("users.xml");

echo "New XML document created successfully!";
?>

<?php

// Create new DOMDocument

$doc = new DOMDocument("1.0", "UTF-8");

// Create root element

$root = $doc->createElement("users");

$doc->appendChild($root);

// Create a new <user> element

$user = $doc->createElement("user");

$user->setAttribute("id", "3");

// Add child elements

$name = $doc->createElement("name", "Ravi");

$email = $doc->createElement("email", "ravi@example.com");

$user->appendChild($name);

$user->appendChild($email);

$root->appendChild($user);

// Save XML to file

$doc->save("users.xml");

echo "New XML document created successfully!";

DOMDocument allows full control to create and save XML.

Modifying Existing XML

<?php
$doc = new DOMDocument();
$doc->load("users.xml");

// Get first <user> element
$user = $doc->getElementsByTagName("user")->item(0);

// Modify child nodes
$user->getElementsByTagName("name")->item(0)->nodeValue = "Vipul Updated";
$user->getElementsByTagName("email")->item(0)->nodeValue = "vipul.updated@example.com";

// Save changes
$doc->save("users.xml");

echo "XML updated successfully!";
?>

<?php

$doc = new DOMDocument();

$doc->load("users.xml");

// Get first <user> element

$user = $doc->getElementsByTagName("user")->item(0);

// Modify child nodes

$user->getElementsByTagName("name")->item(0)->nodeValue = "Vipul Updated";

$user->getElementsByTagName("email")->item(0)->nodeValue = "vipul.updated@example.com";

// Save changes

$doc->save("users.xml");

echo "XML updated successfully!";

You can change node values and attributes.

Deleting Nodes

<?php
$doc = new DOMDocument();
$doc->load("users.xml");

// Remove the second <user>
$users = $doc->getElementsByTagName("user");
$userToRemove = $users->item(1);
$userToRemove->parentNode->removeChild($userToRemove);

// Save changes
$doc->save("users.xml");

echo "User deleted successfully!";
?>

<?php

$doc = new DOMDocument();

$doc->load("users.xml");

// Remove the second <user>

$users = $doc->getElementsByTagName("user");

$userToRemove = $users->item(1);

$userToRemove->parentNode->removeChild($userToRemove);

// Save changes

$doc->save("users.xml");

echo "User deleted successfully!";

parentNode->removeChild() removes nodes from the XML tree.

Key Points

DOMDocument loads XML into a tree structure, allowing full manipulation.
Use getElementsByTagName() to access elements and getAttribute() for attributes.
Use createElement(), appendChild(), and setAttribute() to create XML nodes.
Node values can be modified via nodeValue.
Nodes can be removed using removeChild().
Always save changes with save("filename.xml").

PHP XML DOM Parser