bp_verify_nonce_request( string $action = '', string $query_arg = '_wpnonce' )

function bp_verify_nonce_request( $action = '', $query_arg = '_wpnonce' ) {

	/* Home URL **************************************************************/

	// Parse home_url() into pieces to remove query-strings, strange characters,
	// and other funny things that plugins might to do to it.
	$parsed_home = parse_url( home_url( '/', ( is_ssl() ? 'https' : 'http' ) ) );

	// Maybe include the port, if it's included in home_url().
	if ( isset( $parsed_home['port'] ) ) {
		$parsed_host = $parsed_home['host'] . ':' . $parsed_home['port'];
	} else {
		$parsed_host = $parsed_home['host'];
	}

	// Set the home URL for use in comparisons.
	$home_url = trim( strtolower( $parsed_home['scheme'] . '://' . $parsed_host . $parsed_home['path'] ), '/' );

	/* Requested URL *********************************************************/

	// Maybe include the port, if it's included in home_url().
	if ( isset( $parsed_home['port'] ) && false === strpos( $_SERVER['HTTP_HOST'], ':' ) ) {
		$request_host = $_SERVER['HTTP_HOST'] . ':' . $_SERVER['SERVER_PORT'];
	} else {
		$request_host = $_SERVER['HTTP_HOST'];
	}

	// Build the currently requested URL.
	$scheme        = is_ssl() ? 'https://' : 'http://';
	$requested_url = strtolower( $scheme . $request_host . $_SERVER['REQUEST_URI'] );

	/* Look for match ********************************************************/

	/**
	 * Filters the requested URL being nonce-verified.
	 *
	 * Useful for configurations like reverse proxying.
	 *
	 * @since BuddyPress 1.9.0
	 *
	 * @param string $requested_url The requested URL.
	 */
	$matched_url = apply_filters( 'bp_verify_nonce_request_url', $requested_url );

	// Check the nonce.
	$result = isset( $_REQUEST[$query_arg] ) ? wp_verify_nonce( $_REQUEST[$query_arg], $action ) : false;

	// Nonce check failed.
	if ( empty( $result ) || empty( $action ) || ( strpos( $matched_url, $home_url ) !== 0 ) ) {
		$result = false;
	}

	/**
	 * Fires at the end of the nonce verification check.
	 *
	 * @since BuddyPress 1.6.0
	 *
	 * @param string $action Action nonce.
	 * @param bool   $result Boolean result of nonce verification.
	 */
	do_action( 'bp_verify_nonce_request', $action, $result );

	return $result;
}