# SimpleXMLElement::valid

(PHP 8)

SimpleXMLElement::valid — Check whether the current element is valid

### 说明

public SimpleXMLElement::valid(): bool
警告

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().

### 参数

此函数没有参数。

### 返回值

Returns `true` if the current element is valid, otherwise `false`

### 示例

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
?>`
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