SimpleXMLIterator::valid
(PHP 5, PHP 7, PHP 8)
SimpleXMLIterator::valid — Check whether the current element is valid
说明
public SimpleXMLIterator::valid
(
) : bool
This method checks if the current element is valid after calls to SimpleXMLIterator::rewind() or SimpleXMLIterator::next().
参数
此函数没有参数。
返回值
Returns true if the current element is valid, otherwise false
范例
示例 #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
?>