w3resource

XForms in PHP

In this tutorial, you will see how to create a PHP script that can receive and work with XML data submitted by an XForms form.

An instance document  

<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
<book>
<book_id>BK001</book_id>
<book_name>Introduction to Electrodynamics</book_name>
<isbn_no>0000979001</isbn_no>
<book_price>85.00<book_price>
</book>
<book>
<book_id>BK002</book_id>
<book_name>Understanding of Steel Construction</book_name>
<isbn_no>0000979002</isbn_no>
<book_price>105.50<book_price>
</book>
<book>
<book_id>BK003</book_id>
<book_name>Guide to Networking</book_name>
<isbn_no>0000979003</isbn_no>
<book_price>200.00<book_price>
</book>
<book>
<book_id>BK004</book_id>
<book_name>Transfer  of Heat and Mass</book_name>
<isbn_no>0000979004</isbn_no>
<book_price>250.00<book_price>
</book>
</bookstore>

Form to manage data 


<?xml version="1.0"?>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ev="http://www.w3.org/2001/xml-events"
xmlns:xforms="http://www.w3.org/2002/xforms">
<head>
<title>XForms in PHP Example </title>
<xforms:model id="model_bookstore">
<xforms:instance id="instance_model_bookstore" src="bookstore.xml"/>
<xforms:submission id="submit_model_bookstore"
action="http://localhost/php/xforms/xforms.php"
method="post"/>
</xforms:model>
</head>
<body>
<xforms:submit submission="submit_model_bookstore">
<xforms:label>Submit</xforms:label>
</xforms:submit>
</body>
</html>

PHP script to work with data 

<?php
if (!isset($HTTP_RAW_POST_DATA))
$HTTP_RAW_POST_DATA = file_get_contents("php://input");
$doc = new DOMDocument();
q   $doc->loadXML($HTTP_RAW_POST_DATA);
 $allBooks = $doc->getElementsByTagName('book');
$numBooks = $allBooks->length;
echo "There are ".$numBooks." books";
?>

The $HTTP_RAW_POST_DATA variable is not set by default in many PHP installations; it requires specific configuration changes. You can populate it manually by using the file_get_contents() function to read the data from the input stream.

Next, you can create a new DOM Document, and then use the loadXML() function to load the data. From there, you can manipulate the Document in any way, just as though you had loaded the data from a file or other source.

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PHP: Tips of the Day

In PHP, there are two versions of logical AND and OR operators.

Operator True if
$a and $b Both $a and $b are true
$a && $b Both $a and $b are true
$a or $b Either $a or $b is true
$a || $b Either $a or $b is true

Note that the && and || opererators have higher precedence than and and or. See table below:

Evaluation Result of $e Evaluated as
$e = false || true True $e = (false || true)
$e = false or true False ($e = false) or true

Because of this it's safer to use && and || instead of and and or.