PHP xml_parser_free()用法及代碼示例

前提條件： XML基礎

xml_parser_free()函數是PHP中的內置函數，用於釋放XML解析器。

用法:

bool xml_parser_free( resource $parser )

參數：該函數接受必需的單個參數$parser。它指定要免費的XML解析器的引用。

返回值：如果成功，則此函數返回True；如果失敗，則返回False。

注意：

此函數可用於PHP 4.0.0和更高版本。
這些示例可能不適用於在線IDE。因此，請嘗試在本地服務器或php托管服務器上運行它。

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 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))); 
} 
      
// Freeing xml parser 
xml_parser_free($parser); 
      
fclose($filePointer); 
   
// Character handler function for XML parser 
function char_print($parser, $data) { 
    echo $data; 
} 
   
?>

輸出：

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

程序2:

<?php 
  
// Creating an xml parser 
$parser = xml_parser_create(); 
  
// Element handler function named "starting_handler" 
// enables the 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 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 
$filePointer = fopen("gfg.xml", "r"); 
  
// Reading xml file  
while( $data = fread($filePointer, 4096) ) { 
   
    xml_parse($parser, $data, feof($filePointer)) 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($filePointer); 
  
?>

輸出：

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

參考： https://www.php.net/manual/en/function.xml-parser-free.php

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