Check whether the current element is valid

# SimpleXMLElement::valid

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

### 说明

public function 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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