# XMLReader::open

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

XMLReader::open — Set the URI containing the XML to parse

### 说明

public static XMLReader::open(string `$uri`, ?string `$encoding` = `null`, int `$flags` = 0): XMLReader
public XMLReader::open(string `$uri`, ?string `$encoding` = `null`, int `$flags` = 0): bool

Set the URI containing the XML document to be parsed.

### 参数

`uri`

  URI pointing to the document.

`encoding`

  The document encoding or `null`.

`flags`

  A bitmask of the LIBXML_* constants.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。 If called statically, returns an XMLReader 或者在失败时返回 `false`.

### 错误／异常

- Passing an invalid `encoding` will throw a ValueError.
- This method may be called statically, but prior to PHP 8.0.0, will issue an `E_DEPRECATED` error in this case.

### 更新日志

版本 | 说明
--- | ---
8.4.0 | Passing an invalid `encoding` will now throw a ValueError.
8.0.0 | XMLReader::open() is now declared as static method, but can still be called on an XMLReader instance.

### 参见

- XMLReader::XML() - Set the data containing the XML to parse
- XMLReader::close() - Close the XMLReader input

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