PHP | XMLReader next() Function

The XMLReader::next() function is an inbuilt function in PHP which is used to move cursor to next node skipping all subtrees. Another usage of this function is it accepts the name of the node to directly move to the element.

Syntax:

bool XMLReader::next( string $localname )

Parameters: This function accepts a single parameter $localname which holds the name of the next node where to move.

Return Value: This function returns TRUE on success or FALSE on failure.

Below programs illustrate the XMLReader::next() function in PHP:



Program 1: In this program, we will walk throught the XML tree.
Filename: data.xml

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<?xml version="1.0" encoding="utf-8"?>
<div1>
    <h1> Foo Bar </h1>
    <div2>
        <h1> Foo Bar </h1>
    </div2>
</div1>

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Filename: index.php

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<?php
  
// Create a new XMLReader instance
$XMLReader = new XMLReader();
  
// Open the XML file
$XMLReader->open('data.xml');
  
// Iterate through the XML nodes
// to reach the h1 node
$XMLReader->read();
$XMLReader->read();
$XMLReader->next();
  
  
// Print name of element
echo "Before:<br> We are currently"
   . " at: $XMLReader->name<br>";
  
// Move to next node which is
// text "Foo Bar"
$XMLReader->next();
  
// Move to next element
// which is div2
$XMLReader->next();
  
// Print name of element
echo "After:<br> We are currently"
    . " at: $XMLReader->name";
?>

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Output:
Before:

We are currently at: h1

After:

We are currently at: div2

Program 2: In this program, we will move to a specific node in the XML tree.

Filename:data.xml

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<?xml version="1.0" encoding="utf-8"?>
<div1>
    <h1> Foo Bar </h1>
    <div2>
        <h1> Foo Bar </h1>
    </div2>
    <div3> Hello </div3>
</div1>

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Filename: index.php

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<?php
  
// Create a new XMLReader instance
$XMLReader = new XMLReader();
  
// Open the XML file
$XMLReader->open('data.xml');
  
// Iterate through the XML nodes to
// reach the subtrees of div1
$XMLReader->read();
$XMLReader->read();
$XMLReader->next("div2");
  
// Print name of element
echo "Before:<br> We are currently"
      . "at: $XMLReader->name<br>";
  
// Move to next node which is
// text "Foo Bar"
$XMLReader->next();
  
// Move to next element which is div2
$XMLReader->next();
  
// Print name of element
echo "After:<br> We are currently"
    . " at: $XMLReader->name";
?>

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Output:
Before:

We are currently at: div2

After:

We are currently at: div3

Reference: https://www.php.net/manual/en/xmlreader.next.php




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