PHP | xml_parse_into_struct()函数

简介

xml_parse_into_struct() 是 PHP 中一个用于将 XML 数据解析为结构化数据格式的函数。该函数将 XML 数据转换成 PHP 数组，使得程序员可以更加方便地处理和操作 XML 数据。

xml_parse_into_struct() 函数的语法如下：

xml_parse_into_struct ( resource $parser , string $data , array &$values [, array &$index ] ) : int

该函数需要传入以下参数：

• $parser: 从 xml_parser_create() 返回的 XML 解析器资源。
• $data: 要解析的 XML 数据。
• $values: 解析后的 XML 数据将会被填充到该数组中。
• $index (可选): 将 XML 数据的位置信息填充到该数组中。

该函数将返回一个整数，表示解析后的元素数量。

示例

下面是一个使用 xml_parse_into_struct() 函数解析 XML 数据的简单示例：

<?php
$string = <<<XML
<?xml version='1.0'?>
<books>
  <book id='1'>
    <title>PHP Basics</title>
    <author>John Doe</author>
    <price>29.99</price>
  </book>
  <book id='2'>
    <title>Advanced PHP Topics</title>
    <author>Jane Doe</author>
    <price>39.99</price>
  </book>
</books>
XML;

$parser = xml_parser_create();
xml_parse_into_struct($parser, $string, $values);
xml_parser_free($parser);

print_r($values);
?>

该示例将会输出以下结果：

Array
(
    [0] => Array
        (
            [tag] => books
            [type] => open
            [level] => 1
        )

    [1] => Array
        (
            [tag] => book
            [type] => open
            [level] => 2
            [attributes] => Array
                (
                    [ID] => 1
                )

        )

    [2] => Array
        (
            [tag] => title
            [type] => open
            [level] => 3
        )

    [3] => Array
        (
            [type] => text
            [level] => 3
            [value] => PHP Basics
        )

    [4] => Array
        (
            [tag] => title
            [type] => close
            [level] => 3
        )

    [5] => Array
        (
            [tag] => author
            [type] => open
            [level] => 3
        )

    [6] => Array
        (
            [type] => text
            [level] => 3
            [value] => John Doe
        )

    [7] => Array
        (
            [tag] => author
            [type] => close
            [level] => 3
        )

    [8] => Array
        (
            [tag] => price
            [type] => open
            [level] => 3
        )

    [9] => Array
        (
            [type] => text
            [level] => 3
            [value] => 29.99
        )

    [10] => Array
        (
            [tag] => price
            [type] => close
            [level] => 3
        )

    [11] => Array
        (
            [tag] => book
            [type] => close
            [level] => 2
        )

    [12] => Array
        (
            [tag] => book
            [type] => open
            [level] => 2
            [attributes] => Array
                (
                    [ID] => 2
                )

        )

    [13] => Array
        (
            [tag] => title
            [type] => open
            [level] => 3
        )

    [14] => Array
        (
            [type] => text
            [level] => 3
            [value] => Advanced PHP Topics
        )

    [15] => Array
        (
            [tag] => title
            [type] => close
            [level] => 3
        )

    [16] => Array
        (
            [tag] => author
            [type] => open
            [level] => 3
        )

    [17] => Array
        (
            [type] => text
            [level] => 3
            [value] => Jane Doe
        )

    [18] => Array
        (
            [tag] => author
            [type] => close
            [level] => 3
        )

    [19] => Array
        (
            [tag] => price
            [type] => open
            [level] => 3
        )

    [20] => Array
        (
            [type] => text
            [level] => 3
            [value] => 39.99
        )

    [21] => Array
        (
            [tag] => price
            [type] => close
            [level] => 3
        )

    [22] => Array
        (
            [tag] => book
            [type] => close
            [level] => 2
        )

    [23] => Array
        (
            [tag] => books
            [type] => close
            [level] => 1
        )

)

注意事项

• xml_parse_into_struct() 函数在解析 XML 数据时非常严格，需要确保 XML 数据的格式正确，否则会解析失败。