# simplexml_load_string

(PHP 5, PHP 7, PHP 8)

simplexml_load_string — Interprets a string of XML into an object

### 说明

simplexml_load_string(
string `$data`,
?string `$class_name` = `SimpleXMLElement::class`,
int `$options` = 0,
string `$namespace_or_prefix` = "",
bool `$is_prefix` = `false`
): SimpleXMLElement|false

Takes a well-formed XML string and returns it as an object.

### 参数

`data`

  A well-formed XML string

`class_name`

  You may use this optional parameter so that simplexml_load_string() will return an object of the specified class. That class should extend the SimpleXMLElement class.

`options`

  Bitwise `OR` of the libxml option constants.

`namespace_or_prefix`

  Namespace prefix or URI.

`is_prefix`

  `true` if `namespace_or_prefix` is a prefix, `false` if it's a URI; defaults to `false`.

### 返回值

Returns an object of class SimpleXMLElement with properties containing the data held within the xml document, 或者在失败时返回 `false`.

警告

此函数可能返回布尔值 `false`，但也可能返回等同于 `false` 的非布尔值。请阅读 布尔类型章节以获取更多信息。应使用 === 运算符来测试此函数的返回值。

### 错误／异常

Produces an `E_WARNING` error message for each error found in the XML data.

小技巧

Use libxml_use_internal_errors() to suppress all XML errors, and libxml_get_errors() to iterate over them afterwards.

### 示例

示例 #1 Interpret an XML string

`<?php
$string = <<<XML
<?xml version='1.0'?>
<document>
<title>Forty What?</title>
<from>Joe</from>
<to>Jane</to>
<body>
I know that's the answer -- but what's the question?
</body>
</document>
XML;
$xml = simplexml_load_string($string);
print_r($xml);
?>`

以上示例会输出：

    SimpleXMLElement Object
    (
      [title] => Forty What?
      [from] => Joe
      [to] => Jane
      [body] =>
       I know that's the answer -- but what's the question?
    )

At this point, you can go about using `$xml->body` and such.

### 参见

- simplexml_load_file() - Interprets an XML file into an object
- SimpleXMLElement::__construct() - Creates a new SimpleXMLElement object
- Dealing with XML errors
- libxml_use_internal_errors() - Disable libxml errors and allow user to fetch error information as needed
- Basic SimpleXML usage

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