# XMLReader::setSchema

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

XMLReader::setSchema — Validate document against XSD

### 说明

public XMLReader::setSchema(?string `$filename`): bool

Use W3C XSD schema to validate the document as it is processed. Activation is only possible before the first Read().

### 参数

`filename`

  The filename of the XSD schema.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 错误／异常

Issues `E_WARNING` if libxml was built without schema support, the schema contains errors or if XMLReader::read() has already been called.

### 注释

警告

此函数仅在 PHP 与 libxml 20620 或以上版本编译时可用。

### 参见

- XMLReader::setRelaxNGSchema() - Set the filename or URI for a RelaxNG Schema
- XMLReader::setRelaxNGSchemaSource() - Set the data containing a RelaxNG Schema
- XMLReader::isValid() - Indicates if the parsed document is valid

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