wp_ajax_nopriv_heartbeat()

Source

function wp_ajax_nopriv_heartbeat() {	$response = array();	// 'screen_id' is the same as $current_screen->id and the JS global 'pagenow'.	if ( ! empty( $_POST['screen_id'] ) ) {	$screen_id = sanitize_key( $_POST['screen_id'] );	} else {	$screen_id = 'front';	}	if ( ! empty( $_POST['data'] ) ) {	$data = wp_unslash( (array) $_POST['data'] );	/** * Filters Heartbeat Ajax response in no-privilege environments. * * @since 3.6.0 * * @param array $response The no-priv Heartbeat response. * @param array $data The $_POST data sent. * @param string $screen_id The screen ID. */	$response = apply_filters( 'heartbeat_nopriv_received', $response, $data, $screen_id );	}	/** * Filters Heartbeat Ajax response in no-privilege environments when no data is passed. * * @since 3.6.0 * * @param array $response The no-priv Heartbeat response. * @param string $screen_id The screen ID. */	$response = apply_filters( 'heartbeat_nopriv_send', $response, $screen_id );	/** * Fires when Heartbeat ticks in no-privilege environments. * * Allows the transport to be easily replaced with long-polling. * * @since 3.6.0 * * @param array $response The no-priv Heartbeat response. * @param string $screen_id The screen ID. */	do_action( 'heartbeat_nopriv_tick', $response, $screen_id );	// Send the current time according to the server.	$response['server_time'] = time();	wp_send_json( $response ); } 

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