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What is PHP SimpleXML? If you are a fan of PHP, come in and take a look!

慕斯
慕斯Original
2021-05-31 16:57:492357browse

The previous article introduced you to "Do you know what XML Expat is? How does he define it? 》, this article continues to introduce to you. Regarding the understanding of XML SimpleXML, I believe you will definitely make new discoveries and gains. Come on, let’s explore together!

What is PHP SimpleXML? If you are a fan of PHP, come in and take a look!                                                                                                                                       

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 strings) into objects, for example:

The element is converted into a single attribute of the SimpleXMLElement object . 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 best to use the Expat parser or 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": 

<?xml version="1.0" encoding="ISO-8859-1"?>
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don&#39;t forget me this weekend!</body>
</note>

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

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

The above code will output:

Output the data of each element in the XML file:What is PHP SimpleXML? If you are a fan of PHP, come in and take a look!

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

The above code will output:

Recommended study: "What is PHP SimpleXML? If you are a fan of PHP, come in and take a look!PHP Video Tutorial

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php 关联数组 命名空间 xml Expat simpleXML 字符串 对象 dom
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