PHP xml_parser_create()用法及代码示例

xml_parser_create()函数是PHP中的一个内置函数，用于创建XML解析器。

用法:

resource xml_parser_create( string $encoding )

参数：该函数接受可选的单个参数$encoding。它指定字符编码：

用于PHP 4中的输入/输出
仅用于PHP 5的输出
对于5.0.0和5.0.1，默认输出字符集为ISO-8859-1
从5.0.2起默认输出字符集为UTF-8

返回值：此函数返回成功使用的资源处理程序，如果成功，其他XML函数将使用该资源处理程序；如果失败，则返回False。

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 
$parser = xml_parser_create(); 
   
// set the character handler function 
// for the XML parser 
xml_set_character_data_handler($parser, "char_print"); 
   
// Opening the xml file 
$filePointer = fopen("gfg.xml", "r"); 
   
// Reading xml data from file 
while($data = fread($filePointer, 4096)) { 
   
    // Parseing XML data 
    xml_parse($parser, $data, feof($filePointer)) or
      
    // Display error when parse error occurs 
    die(sprintf("XML Error: %s at line %d", 
      
        // Error string 
        xml_error_string(xml_get_error_code($parser)), 
          
        // Current line 
        xml_get_current_line_number($parser)) 
    ); 
} 
  
// Free to xml parser 
xml_parser_free($parser); 
  
fclose($filePointer); 
   
// Character handler function for XML parser 
function char_print($parser, $data) { 
    echo $data; 
} 
   
?>

输出：

user123 
firstname lastname 
+91-9876543210 
I am John Doe. Live in Kolkata, India.

geeks.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2:

<?php 
  
// Creating an XML parser 
$parser = xml_parser_create(); 
  
// Element handler function named "starting_handler" 
// enables custom manupulation for output 
function starting_handler($parser,  
                $element_name, $element_attrs) { 
      
    switch($element_name) { 
        case "USER": 
            echo "<u>USER DATA</u><br>"; 
            break; 
        case "USERNAME": 
            echo "Username: "; 
            break; 
        case "NAME": 
            echo "Name: "; 
            break; 
        case "PHONE": 
            echo "Phone no: "; 
            break; 
        case "DETAIL": 
            echo "More about user: "; 
    } 
} 
  
// Element handler function named "ending_handler" 
function ending_handler($parser, $element_name) { 
    echo "<br>"; 
} 
  
// Character handler funtion named "char_handler" 
function char_handler($parser, $data) { 
    echo $data; 
} 
  
// Setting the element handlers 
xml_set_element_handler($parser,  
            "starting_handler", "ending_handler"); 
  
// Setting character data handler 
xml_set_character_data_handler($parser, "char_handler"); 
  
// Opening xml file 
$fp = fopen("geeks.xml", "r"); 
  
// Reading xml file  
while ($data = fread($fp, 4096)) { 
   
    xml_parse($parser, $data, feof($fp)) or
      
    // Display error while xml parsing 
    die (sprintf("XML Error: %s at line %d", 
          
        // Error string 
        xml_error_string(xml_get_error_code($parser)), 
          
        // Error line number 
        xml_get_current_line_number($parser)) 
    ); 
} 
  
// Free to xml parser 
xml_parser_free($parser); 
  
// Closing file stream 
fclose($fp); 
  
?>

输出：

USER DATA
Username: user123
Name: firstname lastname
Phone no: +91-9876543210
More about user: I am John Doe. Live in Kolkata, India.

参考： https://www.php.net/manual/en/function.xml-parser-create.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_parser_create() 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。