Related knowledge about PHP Simple XML

PHP Simple XML handles the most common XML tasks, and the rest of the tasks are handled by other extensions. This article will briefly explain them.

What is PHP SimpleXML?

SimpleXML is a new feature in PHP 5.

The SimpleXML extension provides a simple way to get the name and text of an XML element.

Compared to DOM or Expat parsers, SimpleXML can read text data from XML elements in just a few lines of code.

SimpleXML can convert XML documents (or XML string) into objects, for example:

elements are converted into single attributes of SimpleXMLElement objects . When there are multiple elements at the same level, they are placed in an array.

Properties are accessed using an associative array, where the index corresponds to the property name.

The text inside the element is converted to a string. If an element has multiple text nodes, they are arranged in the order in which they are found.

SimpleXML is very fast to use when performing basic tasks like:

Reading/extracting data from XML files/strings

Editing text nodes or attributes

However, when dealing with advanced XML, such as namespaces, it is better to use the Expat parser or the XML DOM.

Installation

Starting with PHP 5, SimpleXML functions are an integral part of PHP core. No installation is required to use these functions.

PHP SimpleXML Example

Suppose we have the following XML file, "note.xml":

491dd2b264d240fb88a27c47a8e35a778197c7d9a62aa70b2f07974ee724bef205034471df6398a62d5708f78b78e0acTove2d00897fd4b69f53670a45a271ef43e0 66fd2ada9ebb04d4250c850dc1e3737eJani73e20527c4b39a5569bf640e17eb894e 6568632082b0fe812193cfc2f7a972bbReminder8d55798a575f05ef42fd91f89ae99e34 6c04bd5ca3fcae76e30b72ad730ca86dDon't forget me this weekend!36cc49f0c466276486e50c850b7e49569cdbc43ffb8d51970a9118e67b3fe241

Now we want to output different information of the above XML file:

Example 1

Output the keys and elements of the $xml variable (which is a SimpleXMLElement object):

<?php$xml=simplexml_load_file("note.xml");print_r($xml);?>

Run the example»

The above code will output:

SimpleXMLElement Object ( [to] => Tove [from] => Jani [heading] => Reminder [body] => Don't forget me this weekend! )

Example 2

Output the data of each element in the XML file:

<?php$xml=simplexml_load_file("note.xml");echo $xml->to . "<br>";echo $xml->from . "<br>";echo $xml->heading . "<br>";echo $xml->body;?>

Run the example»

The above code will output:

ToveJaniReminderDon't forget me this weekend!

Example 3

Output the element name and data of each child node:

<?php$xml=simplexml_load_file("note.xml");echo $xml->getName() . "<br>"; 
foreach($xml->children() as $child){
    echo $child->getName() . ": " . $child . "<br>";}?>

Run the example»

The above code will output:

note
to: Tovefrom: Janiheading: Reminderbody: Don't forget me this weekend!

This article explains the most common XML tasks of PHP Simple XML processing, and more learning materials Please pay attention to php Chinese website to watch. .

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