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PHP - xmlwriter_write_element_ns() Function



Definition and Usage

XML is a mark-up language to share the data across the web, XML is for both human read-able and machine read-able. XMLWriter extension internally has libxml xmlWriter API and is used to write/create the contents of an XML document. The XML documents generated by this are non-cached and forward-only.

The xmlwriter_write_element_ns() function accepts an object of the XMLWriter class, four string values representing a namespace prefix, name of the element and the namespace uri, content of the element respectively as parameters and, creates a full element tag.

Syntax

xmlwriter_write_element_ns($writer, $prefix, $name ,$uri, $content);

Parameters

Sr.No Parameter & Description
1

writer(Mandatory)

This is an object of the XMLWriter class representing the XML document that you want to modify/create.

2

Prefix(Mandatory)

This is a string value representing the prefix of the namespace

3

name(Mandatory)

This is a string value representing the name of the element.

4

uri(Mandatory)

This is a string value specifying the namespace uri.

5

content(Mandatory)

This is a string value representing the contents of the namespaced element.

Return Values

This function returns a boolean value which is TRUE in case of success and FALSE in case of failure.

PHP Version

This function was first introduced in PHP Version 5 and works in all the later versions.

Example

Following example demonstrates the usage of the xmlwriter_start_element_ns() function −

<?php
   //Creating an XMLWriter
   $writer = new XMLWriter();

   //Opening a writer
   $uri = "result.xml";
   $writer = xmlwriter_open_uri($uri);

   //Starting the document
   xmlwriter_start_document($writer);

   //Setting the indentation
   xmlwriter_set_indent($writer,TRUE);
   xmlwriter_set_indent_string($writer, "    ");

   //Starting an element
   xmlwriter_start_element($writer, 'Data');

   //Creating a namespaced element tag
   xmlwriter_write_element_ns($writer, 'ns', 'name', 'test.uri', 'test_data');

   //Ending the document
   xmlwriter_end_document($writer);
   print("XML Document Created");
?>

This will generate the following XML document −

<?xml version="1.0"?>
<Tutorial>
   <ns:name xmlns:ns="test.uri">JavaFX</ns:name>
   <Author>Krishna</Author>
   <Pages>535</Pages>
</Tutorial>

Example

Following is the example of this function in object oriented style −

<?php
   //Creating an XMLWriter
   $writer = new XMLWriter();

   //Opening a writer
   $uri = "result.xml";
   $writer -> openUri($uri);

   //Starting the document
   $writer->startDocument();

   //Setting the indentation
   $writer->setIndent(TRUE);
   $writer->setIndentString("    ");

   //Starting an element
   $writer->startElement('Data');

   //Creating a namespaced element tag
   $writer->writeElementNs('ns', 'name', 'test.uri', 'test_data');

   //Ending the document
   $writer->endDocument();
   print("XML Document Created");
?>

This will generate the following XML document −

<?xml version="1.0"?>
<Data>
   <ns:name xmlns:ns="test.uri">test_data</ns:name>
</Data>
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