PHP | xml_set_character_data_handler() Function

<?php

// Create an XML parser
$xml_parser = xml_parser_create();
 
// Set the character handler function for XML parser
xml_set_character_data_handler($xml_parser, "char_print");

// Opening xml file
$file_pointer = fopen("gfg.xml", "r");

// Reading xml data from file
while($data = fread($file_pointer, 4096)) {
    
    // Parsing XML data
    xml_parse($xml_parser, $data, feof($file_pointer)) or
    
    // Display error when parsing error occurs
    die (sprintf("XML Error: %s at line %d",
        
        // Error string
        xml_error_string(xml_get_error_code($xml_parser)),
        
        // Current line
        xml_get_current_line_number($xml_parser)));
}

// Free to xml parser
xml_parser_free($xml_parser);

fclose($file_pointer);
 
// Character handler function for XML parser
function char_print($xml_parser, $data_to_print) {
    echo $data_to_print;
}
 
?>

<?php

// Create an xml parser
$xml_parser = xml_parser_create();

// Element handler function named "starting_handler"
// enables custom manipulation for output
function starting_handler($xml_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($xml_parser, $element_name) {
    echo "<br>";
}

// Character handler function named "char_handler"
function char_handler($xml_parser, $data) {
    echo $data;
}

// Setting element handlers
xml_set_element_handler($xml_parser,
        "starting_handler", "ending_handler");

// Setting character data handler
xml_set_character_data_handler($xml_parser, "char_handler");

// Opening xml file
$file_pointer = fopen("gfg.xml", "r");

// Reading xml file 
while ($data = fread($file_pointer, 4096)) {
    xml_parse($xml_parser, $data, feof($file_pointer)) or
    
    // Display error while xml parsing
    die (sprintf("XML Error: %s at line %d",
    
        // Error string
        xml_error_string(xml_get_error_code($xml_parser)),
        
        // Error line number
        xml_get_current_line_number($xml_parser)));
}

// Free to xml parser
xml_parser_free($xml_parser);

// Closing file stream
fclose($file_pointer);

?>