wp_doc_link_parse( string $content )

function wp_doc_link_parse( $content ) {
	if ( !is_string( $content ) || empty( $content ) )
		return array();

	if ( !function_exists('token_get_all') )
		return array();

	$tokens = token_get_all( $content );
	$count = count( $tokens );
	$functions = array();
	$ignore_functions = array();
	for ( $t = 0; $t < $count - 2; $t++ ) {
		if ( ! is_array( $tokens[ $t ] ) ) {
			continue;
		}

		if ( T_STRING == $tokens[ $t ][0] && ( '(' == $tokens[ $t + 1 ] || '(' == $tokens[ $t + 2 ] ) ) {
			// If it's a function or class defined locally, there's not going to be any docs available
			if ( ( isset( $tokens[ $t - 2 ][1] ) && in_array( $tokens[ $t - 2 ][1], array( 'function', 'class' ) ) ) || ( isset( $tokens[ $t - 2 ][0] ) && T_OBJECT_OPERATOR == $tokens[ $t - 1 ][0] ) ) {
				$ignore_functions[] = $tokens[$t][1];
			}
			// Add this to our stack of unique references
			$functions[] = $tokens[$t][1];
		}
	}

	$functions = array_unique( $functions );
	sort( $functions );

	/**
	 * Filters the list of functions and classes to be ignored from the documentation lookup.
	 *
	 * @since WP-2.8.0
	 *
	 * @param array $ignore_functions Functions and classes to be ignored.
	 */
	$ignore_functions = apply_filters( 'documentation_ignore_functions', $ignore_functions );

	$ignore_functions = array_unique( $ignore_functions );

	$out = array();
	foreach ( $functions as $function ) {
		if ( in_array( $function, $ignore_functions ) )
			continue;
		$out[] = $function;
	}

	return $out;
}