Pre-requisite: XML Basics
The xml_parser_set_option() function is an inbuilt function in PHP which is used to set the options in an XML parser.
Syntax:
bool xml_parser_set_option( resource $parser,
int $specified_option, mixed $option_value)
Parameters: This function accepts three parameters as mentioned above and described below:
- $parser: It is required parameter which specifies that the XML parser whose options to be set.
- $specified_option: It is required parameter which specifies the options to be set for specified parser.
Possible values of this parameter are:- XML_OPTION_CASE_FOLDING: It is used to check whether case-folding is enabled or not. The value 1 represents enable and 0 represents disable value.
- XML_OPTION_TARGET_ENCODING: It specifies the target encoding in the specified XML parser. Set the name of the encoding (US-ASCII, UTF-8 or ISO-8859-1 etc).
- XML_OPTION_SKIP_TAGSTART: It specifies the number of characters is skipped in the beginning of a tag name.
- XML_OPTION_SKIP_WHITE: It is used to check whether the whitespace characters are skipped or not. The value 1 is used to skip and 0 otherwise.
- $option_value: It is required parameter which specifies that a new value for the specified option to be set.
Return Value: It returns True on success or False on failure.
Note: This function is available for PHP 4.0.0 and newer version.
Program 1:
<?php   // Creating XML parser $parser = xml_parser_create();   // Set the option XML_OPTION_CASE_FOLDING $res = xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);   if( $res ){           // On success     echo "option XML_OPTION_CASE_FOLDING has successfully been set!<br>"; } else {           // On failure     echo "error while setting option XML_OPTION_CASE_FOLDING!<br>"; }   // Setting the option XML_OPTION_TARGET_ENCODING $res = xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, 'UTF-8');   if($res) {       // On success     echo "option XML_OPTION_TARGET_ENCODING has successfully been set!"; } else {           // On failure     echo "error while setting option XML_OPTION_TARGET_ENCODING!"; }   // Free to XML parser xml_parser_free($parser);   ?> |
Output:
option XML_OPTION_CASE_FOLDING has successfully been set! option XML_OPTION_TARGET_ENCODING has successfully been set!
Program 2: This program display the result on wrong value.
<?php   // Creating an XML parser $parser = xml_parser_create();   // Setting the option XML_OPTION_TARGET_ENCODING $res = xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, '0');   if($res) {           // On success     echo "option XML_OPTION_TARGET_ENCODING has successfully been set!"; } else {           // On failure     echo "error while setting option XML_OPTION_TARGET_ENCODING!"; }   // Free to XML parser xml_parser_free($parser);   ?> |
Note: A runtime error will occur for this example as the value is invalid for the option.
Output:
error while setting option XML_OPTION_TARGET_ENCODING!
Reference: https://www.php.net/manual/en/function.xml-parser-set-option.php
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