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The xml_error_string function is used to return the error description information based on the error code. Usually, XML parsing errors will return an error code. This function can convert the error code into a readable string, which facilitates us to understand the specific cause of the error.
<?php
// Error code example
$error_code = 5;
echo xml_error_string($error_code); // Output：Extra content at the end of the document
?>
xml_parser_get_option allows to obtain some status information of the current parser, such as the current location, line number and column number, which is very important for positioning errors.
Commonly used options include:
XML_PARSER_OPTION_ERROR_POSITION : Get the position offset when parsing errors
XML_PARSER_OPTION_LINE_NUMBER : Get the line number of the current parser
XML_PARSER_OPTION_COLUMN_NUMBER : Get the column number of the current parser
The following is an example showing how to use these two functions to quickly locate the line number, column number and cause of XML parsing errors.
<?php
$xml_data = <<<XML
<root>
<item>Item 1</item>
<item>Item 2</item>
<item>Item 3</item> extra
</root>
XML;
$parser = xml_parser_create();
if (!xml_parse($parser, $xml_data, true)) {
$error_code = xml_get_error_code($parser);
$error_msg = xml_error_string($error_code);
$error_line = xml_parser_get_option($parser, XML_PARSER_OPTION_LINE_NUMBER);
$error_column = xml_parser_get_option($parser, XML_PARSER_OPTION_COLUMN_NUMBER);
echo "XML Parsing error：{$error_msg}\n";
echo "The error occurred in the {$error_line} OK，1. {$error_column} List\n";
}
xml_parser_free($parser);
?>
Analysis:
This code tries to parse an XML with an error.
When xml_parse returns false, it means parsing failed.
Get the error code through xml_get_error_code .
Use xml_error_string to get the corresponding error message.
Use xml_parser_get_option to get the wrong line number and column number to accurately locate the problem.
Finally, release the parser resources.
Using xml_error_string , you can convert error codes into human-readable error information.
Quickly locate errors by obtaining the current parser status (especially the row and column numbers) through xml_parser_get_option .
Combining the two can greatly improve the efficiency of debugging XML parsing errors.
Mastering the use of these two functions allows you to quickly find the problem when facing XML parsing exceptions, save debugging time, and improve development efficiency.
