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phpxml_parse_into_struct() 是 PHP 内置的函数之一，用于将 XML 字符串解析为结构化的数组。该函数的语法如下：


bool xml_parse_into_struct (
xmlparser $parser ,
string $data ,
array &$values [, array &$index ]
);


其中，$parser 参数是一个 XML 解析器对象，可以使用 xml_parser_create() 创建；$data 参数是需要解析的 XML 字符串；$values 参数用于存储解析后的结果，以数组形式返回；$index 参数（可选）用于存储每个元素在 $values 数组中的索引。

以下是一个示例代码，演示了如何使用 xml_parse_into_struct() 函数将 XML 字符串解析为数组：

php
$xml = '
<books>
<book>
<title>PHP Cookbook</title>
<author>Adam Trachtenberg</author>
<price>19.99</price>
</book>
<book>
<title>JavaScript: The Definitive Guide</title>
<author>David Flanagan</author>
<price>29.99</price>
</book>
</books>';

// 创建 XML 解析器
$parser = xml_parser_create();

// 解析 XML 字符串
xml_parse_into_struct($parser, $xml, $values);

// 输出解析后的数组
print_r($values);

// 关闭解析器
xml_parser_free($parser);


上述代码将输出以下内容：


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

[1] => Array
(
[tag] => BOOK
[type] => open
[level] => 2
)

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

[3] => Array
(
[tag] => TITLE
[type] => complete
[level] => 3
[value] => PHP Cookbook
)

[4] => Array
(
[tag] => AUTHOR
[type] => open
[level] => 3
)

[5] => Array
(
[tag] => AUTHOR
[type] => complete
[level] => 3
[value] => Adam Trachtenberg
)

[6] => Array
(
[tag] => PRICE
[type] => open
[level] => 3
)

[7] => Array
(
[tag] => PRICE
[type] => complete
[level] => 3
[value] => 19.99
)

[8] => Array
(
[tag] => BOOK
[type] => close
[level] => 2
)

[9] => Array
(
[tag] => BOOK
[type] => open
[level] => 2
)

[10] => Array
(
[tag] => TITLE
[type] => open
[level] => 3
)

[11] => Array
(
[tag] => TITLE
[type] => complete
[level] => 3
[value] => JavaScript: The Definitive Guide
)

[12] => Array
(
[tag] => AUTHOR
[type] => open
[level] => 3
)

[13] => Array
(
[tag] => AUTHOR
[type] => complete
[level] => 3
[value] => David Flanagan
)

[14] => Array
(
[tag] => PRICE
[type] => open
[level] => 3
)

[15] => Array
(
[tag] => PRICE
[type] => complete
[level] => 3
[value] => 29.99
)

[16] => Array
(
[tag] => BOOK
[type] => close
[level] => 2
)

[17] => Array
(
[tag]