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PHP | SimpleXMLIterator valid() Function
  • Last Updated : 29 Aug, 2019

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:

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<?php
  
// Store the xml element to variable
$xml = <<<XML
    <organization>
        <name>GeeksforGeeks</name>
        <address>Noida India</address>
        <contact>
            <email>abc@geeksforgeeks.org</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());
  
?>

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Output:

bool(true)
bool(false)

Program 2:

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<?php
  
// Store the xml element to variable
$xml = <<<XML
    <organization>
        <name>GeeksforGeeks</name>
        <address>Noida India</address>
        <contact>
            <email>abc@geeksforgeeks.org</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());
}
  
?>

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Output:

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

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

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