WordPres 禁止同时登陆-用户交互(八十)

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今天推送的是wordpress教程的文章，感谢您宝贵的时间阅读

下载 Wp Single Login 插件，直接安装启用即可，不需要设置。

下载地址：http://wp101.net/plugins/wp-single-login/

如果不喜欢插件的形式,可以考虑使用代码方法

<?php
/*
Plugin name: WP Single Login
Plugin URI: http://magnigenie.com/wp-single-login/
Description: This plugin will automatically logout the already logged in user when a user with the same login details tries to login from different browser or different computer. This plugin needs zero configuration to run. Just install it if you want single login functionality on your site.
Version: 1.0
Author: Nirmal Ram
Author URI: http://magnigenie.com/about-me/
License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
*/
if( !class_exists( 'wp_single_login' ) ) {
  	class wp_single_login {
		private $session_id; 
	
		function __construct() {
			if ( ! session_id() )
			    session_start();
	
			$this->session_id = session_id();
	
			add_action( 'init', array( $this, 'wpsl_init' ) );
			add_action( 'wp_login', array( $this, 'wpsl_login' ), 10, 2 );
    		add_filter('heartbeat_received', array( $this, 'wpsl_heartbeat_received' ), 10, 2);
			add_filter('heartbeat_nopriv_received', array( $this, 'wpsl_heartbeat_received' ), 10, 2);
			add_filter( 'login_message', array( $this, 'wpsl_loggedout_msg' ), 10 );
		}
	
		function wpsl_init() {
			if( ! is_user_logged_in() )
				return;
			//enqueue the Heartbeat API
			wp_enqueue_script('heartbeat');
			wp_enqueue_script('jquery');
      
			//load our Javascript in the footer
			add_action("wp_footer", array( $this, 'wpsl_scripts' ) );

			$user_sess_id = get_user_meta( get_current_user_id(), '_wpsl_hash', true );
			
			if( $user_sess_id != $this->session_id ) {
				wp_logout(); 
				wp_redirect( site_url( 'wp-login.php?wpsl=loggedout' ) );
				exit;
			}
		}

		function wpsl_login( $user_login, $user ) {
			update_user_meta( $user->ID, '_wpsl_hash', $this->session_id );
			return;
		}

		function wpsl_loggedout_msg() {
				if ( isset($_GET['wpsl']) && $_GET['wpsl'] == 'loggedout' ) {
						$msg = __( "Your session has been terminated as you are logged in from another browser." ) ;
						$message = '<p class="message">'.$msg.'</p><br />';
						return $message;
				}
		}

		function wpsl_heartbeat_received($response, $data) {
			$user_sess_id = get_user_meta( get_current_user_id(), '_wpsl_hash', true );
			if( $data['user_hash'] && $data['user_hash'] != $user_sess_id ){
				$response['wpsl_response'] = 1;
				wp_logout();
			}else{
				$response['wpsl_response'] = 0;
			}
			return $response;
		}
    
		function wpsl_scripts() { ?>
			<script>
			jQuery(document).ready(function() {
				wp.heartbeat.interval( 'fast' );
				//hook into heartbeat-send: and send the current session id to the server
				jQuery(document).on('heartbeat-send', function(e, data) {
					data['user_hash'] = '<?php echo $this->session_id; ?>';	//need some data to kick off AJAX call
				});
				
				//hook into heartbeat-tick: client looks for a 'server' var in the data array and logs it to console
				jQuery(document).on( 'heartbeat-tick', function( e, data ) {			
					if( data['wpsl_response'] ){
						alert( '<?php _e('Your session has been terminated as you are logged in from another browser.'); ?>' );
						window.location.href='<?php echo site_url( 'wp-login.php?wpsl=loggedout' ); ?> ';
					}
				});
			});		
			</script>
		<?php
		}
	}
	new wp_single_login();
}

以上便是插件的源码