PHP | SimpleXMLIterator valid() Function

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The SimpleXMLIterator::valid() function is an inbuilt function in PHP which is used to check the current element is valid or not.

Syntax:

bool SimpleXMLIterator::valid( void )

Parameters: This function does not accept any parameters.

Return Value: This function returns TRUE if the current element is valid, or FALSE on failure.

Below programs illustrate the SimpleXMLIterator::valid() function in PHP:

Program 1:

<?php 
  
// Store the xml element to variable 
$xml = <<<XML 
    <organization> 
        <name>zambiatek</name> 
        <address>Noida India</address> 
        <contact> 
            <email>abc@zambiatek.com</email> 
            <mobile>+91-987654321</mobile> 
        </contact> 
    </organization> 
XML; 
  
$xmlIt = new SimpleXMLIterator($xml); 
  
// Use rewind() function to rewind 
// to the first element 
$xmlIt->rewind(); 
  
// Display the result 
var_dump($xmlIt->valid()); 
  
// Use next() function to move 
// the next element 
$xmlIt->next(); 
$xmlIt->next(); 
$xmlIt->next(); 
  
// Display the result 
var_dump($xmlIt->valid()); 
  
?> 

Output:

bool(true)
bool(false)

Program 2:

<?php 
  
// Store the xml element to variable 
$xml = <<<XML 
    <organization> 
        <name>zambiatek</name> 
        <address>Noida India</address> 
        <contact> 
            <email>abc@zambiatek.com</email> 
            <mobile>+91-987654321</mobile> 
        </contact> 
    </organization> 
XML; 
  
$xmlIt = new SimpleXMLIterator($xml); 
  
// Loop starts from first element of xml and  
// run upto when elements are not valid 
for( $xmlIt->rewind(); $xmlIt->valid(); $xmlIt->next() ) { 
      
    var_dump($xmlIt->key()); 
} 
  
?> 

Output:

string(4) "name"
string(7) "address"
string(7) "contact"

Reference: https://www.php.net/manual/en/simplexmliterator.valid.php

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