PHP - SimpleXMLIterator::valid() 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. The SimpleXMLIterator is used to iterate all the nodes of an XML document.

The

SimpleXMLIterator:: valid()

function is used to verify whether the current element of an iterator is valid.

Syntax

SimpleXMLIterator::valid(void);

Parameters

This function doesn’t accept any parameters.

Return Values

This function returns a boolean value which is TRUE if the current element is valid and, FALSE if not.

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 SimpleXMLIterator::valid() function.

<html>
   <head>
      <body>
         <?php
            $doc = new DOMDocument;
            $data = "<Test><Name>Raju</Name></Test>";
            //Creating the SimpleXMLIterator
            $xmlIterator = new SimpleXMLIterator($data);
            $xmlIterator->rewind(); 
            $res = current($xmlIterator);
            print_r($res. "<br>");
            $isValid = $xmlIterator->valid();
            if($isValid){
               print("Given element is valid");
            } else {
               print("Given element is not valid");
            }			
         ?>      
      </body>
   </head>   
</html>

This will produce following result −

Raju
Given element is valid

Example

Following is another example of this function −

Data.xml:

<Tutorial>
   <Name>Krishna</Name>
   <Pages>30</Pages>
</Tutorial>

sample.html

<html>
   <head>
      <body>
         <?php
            $doc = new DOMDocument;
            //Creating the SimpleXMLIterator
            $xmlIterator = new SimpleXMLIterator("data.xml", 0, TRUE, "", FALSE);
            $xmlIterator->rewind(); 
            if($xmlIterator->valid()){
               print_r($xmlIterator->current()); 
               echo "<br><br>";			
               $xmlIterator->next(); 
               print_r($xmlIterator->current());	
            } else {
               print("Sorry");
            }
         ?>      
      </body>
   </head>   
</html>

This will produce the following output −

SimpleXMLIterator Object ( [0] => Krishna )
SimpleXMLIterator Object ( [0] => 30 )

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