PHP xml_parse_into_struct()用法及代码示例

xml_parse_into_struct()函数是PHP中的内置函数，用于将XML数据解析为数组结构。 XML数据被解析为两个并行的数组结构，第一个是包含指向值数组中值位置的指针的索引数组，第二个是包含来自解析的XML数据的值数组。

用法:

int xml_parse_into_struct( resource $xml_parser, string $data,
                                        array $values, array $index )

参数：该函数接受上述和以下所述的四个参数：

$xml_parser:它是必填参数。它包含XML解析器的引用。
$data:它是必填参数。它包含包含XML数据的字符串。
$values:它是必填参数。它保存包含XML数据值的数组。
$index:它是可选参数。它指定一个数组，该数组带有指向$values中值位置的指针。

返回值：该函数成功返回1，失败返回0。它与True和False不同。

注意：

此函数可用于PHP 4.0.0和更高版本。
这些示例可能不适用于在线IDE。因此，请尝试在本地服务器或php托管服务器上运行它。

gfg.xml文件：

<?xml version="1.0" encoding="utf-8"?> 
<user> 
    <username> user123 </username> 
    <name> firstname lastname </name> 
    <phone> +91-9876543210 </phone> 
    <detail> I am John Doe. Live in Kolkata, India. </detail> 
</user>

程序1:

<?php 
  
// Create an xml parser 
$xml_parser = xml_parser_create(); 
  
// Opening xml file in file stream 
$filePointer = fopen("sample.xml", "r"); 
  
// Reading XML data from the 
// specified XML file 
$xml_data = fread($filePointer, 4096); 
   
// Parseing XML data into an 
// array structure 
xml_parse_into_struct($xml_parser, 
                $xml_data, $values); 
  
// Free to xml parse 
xml_parser_free($xml_parser); 
  
// Display array structured XML data 
print_r($values); 
  
// Closing the XML file 
fclose($filePointer); 
  
?>

输出：

Array
(
    [0] => Array
        (
            [tag] => USER
            [type] => open
            [level] => 1
            [value] => 
        )
    [1] => Array
        (
            [tag] => USERNAME
            [type] => complete
            [level] => 2
            [value] =>  user123 
        )
    [2] => Array
        (
            [tag] => USER
            [value] => 
            [type] => cdata
            [level] => 1
        )
    [3] => Array
        (
            [tag] => NAME
            [type] => complete
            [level] => 2
            [value] =>  firstname lastname 
        )
    [4] => Array
        (
            [tag] => USER
            [value] => 
            [type] => cdata
            [level] => 1
        )
    [5] => Array
        (
            [tag] => PHONE
            [type] => complete
            [level] => 2
            [value] =>  +91-9876543210 
        )
    [6] => Array
        (
            [tag] => USER
            [value] => 
            [type] => cdata
            [level] => 1
        )
    [7] => Array
        (
            [tag] => DETAIL
            [type] => complete
            [level] => 2
            [value] =>  I am John Doe. Live in Kolkata, India. 
        )
    [8] => Array
        (
            [tag] => USER
            [value] => 
            [type] => cdata
            [level] => 1
        )
    [9] => Array
        (
            [tag] => USER
            [type] => close
            [level] => 1
        )
)

geeks.xml文件：

<?xml version="1.0"?> 
<atoms> 
    <atom> 
        <name>Carbon</name> 
        <symbol>C</symbol> 
        <atomic_no>6</atomic_no> 
    </atom> 
    <atom> 
        <name>Hydrogen</name> 
        <symbol>H</symbol> 
        <atomic_no>1</atomic_no> 
    </atom> 
    <atom> 
        <name>Helium</name> 
        <symbol>He</symbol> 
        <atomic_no>2</atomic_no> 
    </atom> 
    <atom> 
        <name>Iron</name> 
        <symbol>Fe</symbol> 
        <atomic_no>26</atomic_no> 
    </atom> 
</atoms>

程序2:

<?php 
   
class Atom { 
    var $name;  // Name of the element 
    var $symbol;    // Symbol for the atom 
    var $atomic_no;  // Atomic number  
      
    // Constructor for Atom class 
    function __construct( $aa ) { 
          
        // Initializing or setting the values  
        // to the field of the Atom class 
        foreach ($aa as $k=>$v) 
            $this->$k = $aa[$k]; 
    } 
} 
   
function read_data($filename) { 
      
    // Read the XML database of atoms 
    $xml_data = implode("", file($filename)); 
      
    // Creating an xml parser 
    $xml_parser = xml_parser_create(); 
      
    xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, 0); 
    xml_parser_set_option($xml_parser, XML_OPTION_SKIP_WHITE, 1); 
    xml_parse_into_struct($xml_parser, $xml_data, $values, $tags); 
      
    // Free to xml parser 
    xml_parser_free($xml_parser); 
   
    // Iterating through the structures 
    foreach ($tags as $key=>$val) { 
          
        if ($key == "atom") { 
              
            $atom_ranges = $val; 
              
            // Each contiguous pair of array entries 
            // are the lower and upper range for 
            // each molecule definition 
            for($i = 0; $i < count($atom_ranges); $i += 2) { 
                $offset = $atom_ranges[$i] + 1; 
                $len = $atom_ranges[$i + 1] - $offset; 
                  
                // Parsing atom data 
                $tdb[] = parseAtoms(array_slice($values, $offset, $len)); 
            } 
        } 
        else { 
            continue; 
        } 
    } 
    return $tdb; 
} 
  
// parseAtoms function to parse atom 
function parseAtoms($mvalues) { 
    for ($i = 0; $i < count($mvalues); $i++) { 
        $ato[$mvalues[$i]["tag"]] = $mvalues[$i]["value"]; 
    } 
    return new Atom($ato); 
} 
  
$db = read_data("atoms.xml"); 
echo "Database of atoms objects:\n"; 
print_r($db); 
  
?>

输出：

Database of atoms objects:
Array
(
    [0] => Atom Object
        (
            [name] => Carbon
            [symbol] => C
            [atomic_no] => 6
        )
    [1] => Atom Object
        (
            [name] => Hydrogen
            [symbol] => H
            [atomic_no] => 1
        )
    [2] => Atom Object
        (
            [name] => Helium
            [symbol] => He
            [atomic_no] => 2
        )
    [3] => Atom Object
        (
            [name] => Iron
            [symbol] => Fe
            [atomic_no] => 26
        )
)

参考： https://www.php.net/manual/en/function.xml-parse-into-struct.php

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注：本文由纯净天空筛选整理自gekcho大神的英文原创作品 PHP | xml_parse_into_struct() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。