XML is a mark-up language to share the data across the web, XML is for both human read-able and machine read-able. Example of share-able xmls are RSS Feeds. XML parsers are useful to read and update the data by using web browsers.

Types of XML

• Tree based
• Event based

XML Parse Extensions

XML parse Extensions are works based on libxml. The following xml parsers are available in the php core.
• Simple XML parser
• DO XML parser
• XML parser
• XML Reader

Simple XML parser

The Simple XML parser also called as tree based XML parser and it will parse the simple XML file. Simple XML parse will call simplexml_load_file() method to get access to the xml from specific path.

DOM parser

DOM Parser also called as a complex node parser, Which is used to parse highly complex XML file. It is used as interface to modify the XML file. DOM parser has encoded with UTF-8 character encoding.

XML parse

XML parsing is based on SAX parse. It is more faster the all above parsers. It will create the XML file and parse the XML. XML parser has encoded by ISO-8859-1, US-ASCII and UTF-8 character encoding.

XML Reader

XML Reader parse also called as Pull XML parse. It is used to read the XML file in a faster way. It works with high complex XML document with XML Validation.

PHP – Simple XML

The simple XML parser

The simple XML parser is used to parse Name, attributes and textual content.
The simple XML functions are shown below −

simplexml_load_file()

This function accepts file path as a first parameter and it is mandatory.
simplexml_load_file(($fileName,$class,$options,$ns,$is_prefix)

simplexml_load_string()

This function accepts the string instead of file reference.
simplexml_load_string($XMLData,$class,$options,$ns,$is_prefix)

simplexml_import_dom()

This function accepts DOM formatted XML content and it converts into simple XML.
simplexml_load_string($DOMNode,$class)
The following example shows, How to parse a xml data file.

<?php
$data = "<?xml version = '1.0' encoding = 'UTF-8'?>
<note>
<Course>Android</Course>
<Subject>Android</Subject>
<Company>Tecklearn</Company>
<Price>$10</Price>
</note>";
$xml = simplexml_load_string($data) or die("Error: Cannot create object");
?>
<html>
<head>
<body>
<?php
print_r($xml);
?>
</body>
</head>
</html>
It will produce the following result −
SimpleXMLElement Object ( [Course] => Android [Subject] => Android [Company] => Tecklearn [Price] => $10 )
We can also call a xml data file as shown below and it produces the same result as shown above −
<?php
$xml = simplexml_load_file("data") or die("Error: Cannot create object");
print_r($xml);
?>

PHP – Simple XML GET

XML Get has used to get the node values from xml file. The following example shows, How to get the data from xml.

Note.xml

Note.xml is xml file, It can accessed by php file.
<SUBJECT>
<COURSE>Android</COURSE>
<COUNTRY>India</COUNTRY>
<COMPANY>Tecklearn</COMPANY>
<PRICE>$10</PRICE>
</SUBJECT>

Index.htm

Index page has rights to get access the xml data by using implexml_load_file().
<?php
$xml = simplexml_load_file("note.xml") or die("Error: Object Creation failure");
?>

<html>
<head>

<body>

<?php
echo $xml->COURSE . "<br>";
echo $xml->COUNTRY . "<br>";
echo $xml->COMPANY . "<br>";
echo $xml->PRICE;
?>

</body>

</head>
</html>

Get Node Values

The below code is having information about how to get node values from xml file and XML should be as follows −
<?xml version = "1.0" encoding = "utf-8"?>
<tecklearn>

<course category = "JAVA">
<title lang = "en">Java</title>
<tutor>Gopal</tutor>
<duration></duration>
<price>$30</price>
</course>

<course category = "HADOOP">
<title lang = "en">Hadoop</title>.
<tutor>Satish</tutor>
<duration>3>/duration>
<price>$50</price>
</course>

<course category = "HTML">
<title lang = "en">html</title>
<tutor>raju</tutor>
<duration>5</duration>
<price>$50</price>
</course>

<course category = "WEB">
<title lang = "en">Web Technologies</title>
<tutor>Javed</tutor>
<duration>10</duration>
<price>$60</price>
</course>

</tecklearn>
PHP code should be as follows
<html>
<body>

<?php
$xml = simplexml_load_file("books.xml") or die("Error: Cannot create object");

foreach($xml->children() as $books) {
echo $books->title . "<br> ";
echo $books->tutor . "<br> ";
echo $books->duration . "<br> ";
echo $books->price . "<hr>";
}
?>

</body>
</html>
It will produce the following result −

php 1 1

So, this brings us to the end of blog. This Tecklearn ‘PHP-XML Introduction’ blog helps you with commonly asked questions if you are looking out for a job in PHP Programming. If you wish to learn Java and build a career Java Programming domain, then check out our interactive, Java and JEE Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

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• Introduction to J2EE
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• Setting up a web project in Eclipse
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• GET and POST request in web application with demo
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