Php/docs/function.simplexml-load-file

• PHP Manual
• SimpleXML 函数
• Interprets an XML file into an object

simplexml_load_file

(PHP 5, PHP 7)

simplexml_load_file — Interprets an XML file into an object

说明

simplexml_load_file ( string $filename [, string $class_name = "SimpleXMLElement" [, int $options = 0 [, string $ns = "" [, bool $is_prefix = false ]]]] ) : SimpleXMLElement|false

Convert the well-formed XML document in the given file to an object.

参数

filename

Path to the XML file

Note:

Libxml 2 unescapes the URI, so if you want to pass e.g. b&c as the URI parameter a, you have to call simplexml_load_file(rawurlencode('http://example.com/?a=' . urlencode('b&c'))). Since PHP 5.1.0 you don't need to do this because PHP will do it for you.

class_name

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

options

Since PHP 5.1.0 and Libxml 2.6.0, you may also use the options parameter to specify additional Libxml parameters.

ns

Namespace prefix or URI.

is_prefix

true if ns 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.

Warning 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.

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

更新日志

版本	说明
5.2.0	The optional parameter is_prefix was added.

范例

Example #1 Interpret an XML document

<?php// The file test.xml contains an XML document with a root element// and at least an element /[root]/title.if (file_exists('test.xml')) {    $xml = simplexml_load_file('test.xml');     print_r($xml);} else {    exit('Failed to open test.xml.');}?>

This script will display, on success:

SimpleXMLElement Object
(
  [title] => Example Title
  ...
)

At this point, you can go about using $xml->title and any other elements.

参见

• simplexml_load_string() - Interprets a string of XML 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