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Filename : link-parse-opml.php
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<?php
/**
 * Parse OPML XML files and store in globals.
 *
 * @package WordPress
 * @subpackage Administration
 */

if ( ! defined( 'ABSPATH' ) ) {
	die();
}

/**
 * @global string $opml
 */
global $opml;

/**
 * Starts a new XML tag.
 *
 * Callback function for xml_set_element_handler().
 *
 * @since 0.71
 * @access private
 *
 * @global array $names
 * @global array $urls
 * @global array $targets
 * @global array $descriptions
 * @global array $feeds
 *
 * @param resource $parser   XML Parser resource.
 * @param string   $tag_name XML element name.
 * @param array    $attrs    XML element attributes.
 */
function startElement( $parser, $tag_name, $attrs ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
	global $names, $urls, $targets, $descriptions, $feeds;

	if ( 'OUTLINE' === $tag_name ) {
		$name = '';
		if ( isset( $attrs['TEXT'] ) ) {
			$name = $attrs['TEXT'];
		}
		if ( isset( $attrs['TITLE'] ) ) {
			$name = $attrs['TITLE'];
		}
		$url = '';
		if ( isset( $attrs['URL'] ) ) {
			$url = $attrs['URL'];
		}
		if ( isset( $attrs['HTMLURL'] ) ) {
			$url = $attrs['HTMLURL'];
		}

		// Save the data away.
		$names[]        = $name;
		$urls[]         = $url;
		$targets[]      = $attrs['TARGET'] ?? '';
		$feeds[]        = $attrs['XMLURL'] ?? '';
		$descriptions[] = $attrs['DESCRIPTION'] ?? '';
	} // End if outline.
}

/**
 * Ends a new XML tag.
 *
 * Callback function for xml_set_element_handler().
 *
 * @since 0.71
 * @access private
 *
 * @param resource $parser   XML Parser resource.
 * @param string   $tag_name XML tag name.
 */
function endElement( $parser, $tag_name ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
	// Nothing to do.
}

// Create an XML parser.
if ( ! function_exists( 'xml_parser_create' ) ) {
	wp_trigger_error( '', __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) );
	wp_die( __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) );
}

$xml_parser = xml_parser_create();

// Set the functions to handle opening and closing tags.
xml_set_element_handler( $xml_parser, 'startElement', 'endElement' );

if ( ! xml_parse( $xml_parser, $opml, true ) ) {
	printf(
		/* translators: 1: Error message, 2: Line number. */
		__( 'XML Error: %1$s at line %2$s' ),
		xml_error_string( xml_get_error_code( $xml_parser ) ),
		xml_get_current_line_number( $xml_parser )
	);
}

if ( PHP_VERSION_ID < 80000 ) { // xml_parser_free() has no effect as of PHP 8.0.
	// Free up memory used by the XML parser.
	xml_parser_free( $xml_parser );
}

unset( $xml_parser );