# XMLReader::isValid

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

XMLReader::isValid — Indicates if the parsed document is valid

### 说明

public XMLReader::isValid(): bool

Returns a boolean indicating if the document being parsed is currently valid according to the DTD, or an XML or RelaxNG schema. If there is no schema, and the DTD validation option is not provided, this method will return `false`.

### 参数

此函数没有参数。

### 返回值

Returns `true` when the document is valid or `false` otherwise.

### 示例

示例 #1 Validating XML

`<?php
$xml = XMLReader::open('examples/book-simple.xml');
// The validate parser option must be enabled for
// this method to work properly
$xml->setParserProperty(XMLReader::VALIDATE, true);
var_dump($xml->isValid());
?>`

### 注释

> 注意: This checks the current node, not the entire document.

### 参见

- XMLReader::setParserProperty() - Set parser options
- XMLReader::setRelaxNGSchema() - Set the filename or URI for a RelaxNG Schema
- XMLReader::setRelaxNGSchemaSource() - Set the data containing a RelaxNG Schema
- XMLReader::setSchema() - Validate document against XSD

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