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PHP SimpleXMLIterator valid () function

Syntax:
bool SimpleXMLIterator::valid (void)
Parameters:this function takes no parameters.Return Value:This function returns TRUE if the current item is valid, or FALSE if it fails.The following programs illustrate PHP’s SimpleXMLIterator::valid() function:Program 1:  
// Save the xml element to a variable $xml = < < < XML < organization > < name > GeeksforGeeks < / name >
Noida India
< contact > < email > [email protected]< / email > < mobile > + 91-987654321 < / mobile > < / contact > < / organization > XML; $xmlIt = new SimpleXMLIterator ( $xml );  
// Use the rewind() function to rewind
// to the first element $xmlIt -> rewind ();  
// Show result var_dump ( $xmlIt -> valid());  
// Use the next() function to navigate
// next element $xmlIt -> next(); $xmlIt -> next(); $xmlIt -> next();  
// Show result var_dump ( $xmlIt -> valid());  
?>
Exit:
bool (true ) bool (false)
Program 2:  
// Save the xml element to a variable $xml = < < < XML < organization > < name > GeeksforGeeks < / name >
Noida India
< contact > < email > [email protected]< / email > < mobile > + 91-987654321 < / mobile > < / contact > < / organization > XML; $xmlIt = new SimpleXMLIterator ( $xml );  
// the loop starts from the first xml element and
// run when elements are invalid for ( $xmlIt -> rewind (); $xmlIt -> valid(); $xmlIt -> next()) {   var_dump ( $xmlIt -> key()); }  
?>
Exit:
string (4 ) "name" string (7) "address" string (7) "contact"
Link: https://www.php.net/manual/en/simplexmliterator.valid.php

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