(PHP 5, PHP 7)
SimpleXMLIterator::valid — Check whether the current element is valid
public SimpleXMLIterator::valid ( ) : bool
This method checks if the current element is valid after calls to SimpleXMLIterator::rewind() or SimpleXMLIterator::next().
This function has no parameters.
Returns true if the current element is valid, otherwise false
Example #1 Check whether the current element is valid
<?php
$xmlIterator = new SimpleXMLIterator('<books><book>SQL Basics</book></books>');
$xmlIterator->rewind(); // rewind to the first element
echo var_dump($xmlIterator->valid()); // bool(true)
$xmlIterator->next(); // advance to the next element
echo var_dump($xmlIterator->valid()); // bool(false) because there is only one element
?>
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https://www.php.net/manual/en/simplexmliterator.valid.php