PHP - XMLReader::moveToFirstAttribute() 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. XMLReader extension is used to read/retrieve the contents of an XML document i.e. using the methods of the XMLReader class you can read each node of an XML document.

The XMLReader::moveToFirstAttribute() function of the XMLReader class moves the cursor to the first attribute in the XML document.

Syntax

XMLReader::moveToFirstAttribute();

Parameters

This function does not accept any parameters.

Return Values

This function returns a boolean value which is TRUE on success and FALSE incase 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 XMLReader::moveToFirstAttribute() function −

data.xml

<Employee>
   <Name id1 = "attr_name">Krishna</Name>
   <Age id2 = "attr_age">22</Age>
   <City id3 = "attr_city">Hyderabad</City>   
   <Phone id4 = "attr_phone">980000000</Phone>   
</Employee>

sample.php

<?php
   //Creating an XMLReader
   $reader = new XMLReader();

   //Opening a reader
   $reader->open("trail.xml");

   //Reading the contents of the XML file
   $reader->read();
   $reader->read();
   $reader->read();

   if ($reader->nodeType == XMLREADER::ELEMENT) { 
      $res = $reader->moveToAttribute('id4'); 
      $reader->moveToElement(); 
      print($reader->name."\n");

      $reader->moveToFirstAttribute(); 
      print($reader->name."\n");
   }

   //Closing the reader
   $reader->close();
?>

This will produce following result −

Name
id1

Example

Following is another example of this function −

<?php
   //Creating an XMLReader
   $reader = new XMLReader();
   $data= "<data> 
      <name att1 = 'test_attribute1'>Raju</name> 
      <age>32</age> 
      <phone>9848022338</phone> 
      <city att2 = 'test_attribute2'>Hyderabad</city>
   </data> 

   //Opening a reader
   $reader->xml($data);

   //Reading the contents of the XML file
   $reader->read();
   $reader->read();
   $reader->read();

   if ($reader->nodeType == XMLREADER::ELEMENT) { 
      $res = $reader->moveToAttribute('test_attribute2'); 
      print($reader->name."\n");

      $reader->moveToFirstAttribute(); 
      print($reader->name."\n");
   }

   //Closing the reader
   $reader->close();
?>

This will produce following result −

name
att1