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SimpleXMLElement::valid — Check whether the current element is valid
Prior to PHP 8.0, SimpleXMLElement::valid() was only declared on the subclass SimpleXMLIterator.
This method checks if the current element is valid after calls to SimpleXMLElement::rewind() or SimpleXMLElement::next().
此函数没有参数。
Returns true if the current element is valid, otherwise false
示例 #1 Check whether the current element is valid
<?php
$xmlElement = new SimpleXMLElement('<books><book>SQL Basics</book></books>');
$xmlElement->rewind(); // rewind to the first element
echo var_dump($xmlElement->valid()); // bool(true)
$xmlElement->next(); // advance to the next element
echo var_dump($xmlElement->valid()); // bool(false) because there is only one element
?>