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Reading XML files with the “simplexml_load_file()” function - PHP

In the first article of a three-part series, you will learn the basics of using the “simplexml” extension that comes with PHP 5. This library is primarily focused on parsing simple XML files, and can save you a lot of work.

TABLE OF CONTENTS:
  1. Introducing SimpleXML in PHP 5
  2. Reading XML files with the “simplexml_load_file()” function
  3. Accessing file nodes as array elements
  4. Creating a basic XML parsing class
By: Alejandro Gervasio
Rating: starstarstarstarstar / 51
June 12, 2006

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In order to begin tasting the power of the “simpleXML” extension, I’ll start with a simple example, which shows how to read the contents of a basic XML file. This extension will allow you do this in different ways, but in this case, I’ll use the “simplexml_load_file()” function, in conjunction with the following sample XML file:

<?xml version="1.0" encoding="iso-8859-1"?>
<users>
<user>
<name>John Doe</name>
<address>Binary Avenue 1234 FL</address>
<email>john@john-domain.com</email>
</user>
<user>
<name>Janet Smith</name>
<address>Crazy Bits Road 4568 CA</address>
<email>janet@janet-domain.com</email>
</user>
<user>
<name>James Smith</name>
<address>Socket Boulevard 7894 OH</address>
<email>james@james-domain.com</email>
</user>
<user>
<name>Silvia Wilson</name>
<address>Protocol Avenue 5652 NY</address>
<email>silvia@silvia-domain.com</email>
</user>
<user>
<name>Alejandro Gervasio</name>
<address>Boulevard of Objects 10101 AR</address>
<email>alejandro@alejandro-domain.com</email>
</user>
</users>

Fine, now that I have a simple XML file to work with, have a look at the following script, which first reads the nodes of this file and next displays them by using a “foreach” loop:

// displays all the file nodes
if(!$xml=simplexml_load_file('users.xml')){
    trigger_error('Error reading XML file',E_USER_ERROR);
}
echo 'Displaying contents of XML file...<br />';
foreach($xml as $user){
    echo 'Name: '.$user->name.' Address: '.$user->address.'
Email: '.$user->email.'<br />';
}

As you can see, the previous script loads the contents of the XML file by using the “simplexml_load_file()” function and then loops over the corresponding nodes, outputting the following values:

Displaying contents of XML file...
Name: John Doe Address: Binary Avenue 1234 FL Email: john@john-
domain.com
Name: Janet Smith Address: Crazy Bits Road 4568 CA Email: janet@janet-domain.com
Name: James Smith Address: Socket Boulevard 7894 OH Email:
james@james-domain.com
Name: Silvia Wilson Address: Protocol Avenue 5652 NY Email:
silvia@silvia-domain.com
Name: Alejandro Gervasio Address: Boulevard of Objects 10101 AR
Email: alejandro@alejandro-domain.com

That was really easy, right? The cool “simplexml_load_file()” function loads the contents of a specific XML file passed as an argument onto an object, which exposes the different file nodes as properties. In order to access the nodes in question, all you have to do is use the “->” notation, and you’re done.

Now, let me go one step further and demonstrate how to access the contents of a single node. The example shown below teaches you how to display the contents of all the <name> nodes included within the previous XML file:

// displays contents of <name> nodes
if(!$xml=simplexml_load_file('users.xml')){
    trigger_error('Error reading XML file',E_USER_ERROR);
}
echo 'Displaying user names of XML file...<br />';
foreach($xml as $user){
    echo 'Name: '.$user->name.'<br />';
}

In this case, all the <name> nodes are accessed as object properties, and displayed as follows:

Displaying user names of XML file...
Name: John Doe
Name: Janet Smith
Name: James Smith
Name: Silvia Wilson
Name: Alejandro Gervasio

Definitely, you’ll have to agree with me that the “simpleXML” extension makes it really easy to parse XML files, at least when you only need to perform basic tasks on a given file, such as reading all of the file nodes or accessing a particular one.

However, there are still more useful things to explore regarding the use of the “simplexml_load_file()” function. Therefore, in the next section of this tutorial, I’ll show you how to access a specific node within an XML file by using an array notation. Please continue reading to learn more.



 
 
>>> More PHP Articles          >>> More By Alejandro Gervasio
 

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