PHP xml_error_string()用法及代碼示例

前提條件： XML基礎

xml_error_string()函數是PHP中的內置函數，它返回XML解析器錯誤描述以生成錯誤代碼。

用法:

string xml_error_string( int $error_code)

參數：該函數接受單個參數$error_code。它指定了從xml_get_error_code()函數生成的XML解析器錯誤代碼。

返回值：此函數針對成功時從xml_get_error_code()生成的指定錯誤代碼返回XML解析器錯誤描述，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。

以下示例程序旨在說明PHP中的xml_error_string()函數：

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> 
</users>

程序1:

<?php 
  
// Invalid XML file 
$xml_file= 'gfg.xml'; 
  
// XML parser initialization 
$xml_parser = xml_parser_create(); 
   
// Opening the file in read mode 
$file_pointer = fopen($xml_file, 'r'); 
   
// Reading data from the file stream 
while ($xml_data = fread($file_pointer, 4096)) { 
    
    // Parsing the data chunk 
    if (!xml_parse($xml_parser, $xml_data, feof($file_pointer))) { 
        
        // Display error  
        die( print "ERROR:" .  
          
            // Error string 
            xml_error_string(xml_get_error_code($xml_parser)) .  
              
            "<br>Error Code:" .  
              
            // Error code 
            xml_get_error_code($xml_parser) .  
              
            "<br>Line:" .  
              
            // Line number where the error occured     
            xml_get_current_line_number($xml_parser) .  
              
            "<br>Column:" .  
              
            // Column number where the error occured     
            xml_get_current_column_number($xml_parser) .  
              
            "<br>Byte Index:" .  
              
            // Byte index where the current byte occured 
            xml_get_current_byte_index($xml_parser) . "<br>"
        ); 
    } 
} 
  
// Free to xml parser 
xml_parser_free($xml_parser); 
  
?>

輸出：

ERROR:Mismatched tag
Error Code:76
Line:7
Column:13
Byte Index:208

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 
  
// Invalid XML file 
$xml_file= 'geeks.xml'; 
  
// XML parser initialization 
$xml_parser = xml_parser_create(); 
   
// Opening the file in read mode 
$file_pointer = fopen($xml_file, 'r'); 
   
// Reading data from the file stream 
while ($xml_data = fread($file_pointer, 4096)) { 
    
    // Parsing the data chunk 
    if (!xml_parse($xml_parser, $xml_data, feof($file_pointer))) { 
        
        // Display error  
        die( print "ERROR:" .  
          
            // Error string 
            xml_error_string(xml_get_error_code($xml_parser)) .  
              
            "<br>Error Code:" .  
              
            // Error code 
            xml_get_error_code($xml_parser) .  
              
            "<br>Line:" .  
              
            // Line number where the error occured     
            xml_get_current_line_number($xml_parser) .  
              
            "<br>Column:" .  
              
            // Column number where the error occured     
            xml_get_current_column_number($xml_parser) .  
              
            "<br>Byte Index:" .  
              
            // Byte index where the current byte occured 
            xml_get_current_byte_index($xml_parser) . "<br>"
        ); 
    } 
} 
  
// Free to xml parser 
xml_parser_free($xml_parser); 
  
?>

輸出：

ERROR:String not closed expecting " or '
Error Code:34
Line:1
Column:36
Byte Index:37

參考： https://www.php.net/manual/en/function.xml-error-string.php

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