用户一次只能从一台计算机登录。如果用户停用30分钟，他可以从另一台计算机登录。在不同的浏览器中尝试。您必须执行两个步骤：
在数据库中的wp\\U用户表中创建2列（uni\\U哈希、会话时间）
"ALTER TABLE `wp_users` ADD COLUMN `uni_hash` VARCHAR( 80 ) NOT NULL";
"ALTER TABLE `wp_users` ADD COLUMN `session_time` int(11) DEFAULT NULL";
2./在函数中粘贴此代码。php。
<?php
function myStartSession() {
if(!session_id()) {
session_start();}
}
function myEndSession() {
session_unset();
session_destroy();
}
if( !function_exists(\'single_user_login_uid_create\')){
function single_user_login_uid_create($ID){
global $wpdb;
$get_hash = $wpdb->get_results("SELECT uni_hash FROM `wp_users` WHERE user_login=\'".$ID."\'");
if(isset($_COOKIE["user_uni_uid".$ID.""])){
$user_uni_uid = $_COOKIE["user_uni_uid".$ID.""];
if($get_hash[0]->uni_hash == \'\'){ $hash_result = $_COOKIE["user_uni_uid".$ID.""];}
else{$hash_result = $get_hash[0]->uni_hash; }
}else{
$user_uni_uid = \'hash\';
if($get_hash[0]->uni_hash != \'\'){ $hash_result = $get_hash[0]->uni_hash;}
else{$hash_result = \'hash\'; }
}
$check_time = $wpdb->get_results("SELECT session_time FROM `wp_users` WHERE user_login=\'".$ID."\'");
if(!is_null($check_time)){$time_result = $check_time[0]->session_time;}
else{$time_result = time()-2000;}
if( (time() - $time_result < 1800)&&($hash_result != $user_uni_uid) ){
myEndSession();
wp_clearcookie();
wp_die(\'<h1>User is login! </h1>\', \'\', array( \'back_link\' => true ));
do_action(\'wp_logout\');
nocache_headers();
$redirect_to = home_url();
wp_redirect($redirect_to);
exit();
}else{
$_SESSION["LAST_ACTIVITY"] = time();
$new_time = $_SESSION["LAST_ACTIVITY"];
$randUID = md5(microtime().$_SERVER[\'REMOTE_ADD\'] );
$sql = "UPDATE `wp_users` set `uni_hash`=\'".$randUID."\', `session_time`=\'".$new_time."\' WHERE user_login=\'".$ID."\'";
$wpdb->get_results($sql);
setcookie("user_uni_uid", $randUID, 9999999999);
}
}
}
if( !function_exists(\'single_user_login_uid_check\')){
function single_user_login_uid_check(){
global $wpdb;
$ID = wp_get_current_user();
$logout_url = wp_logout_url(home_url());
$user_uni_uid = $_COOKIE["user_uni_uid".$ID->user_login.""];
$sql = "SELECT uni_hash FROM `wp_users` WHERE uni_hash=\'".$user_uni_uid."\'";
$getinfo = $wpdb->get_results($sql);
$check_time = $wpdb->get_results("SELECT session_time FROM `wp_users` WHERE user_login=\'".$ID->user_login."\'");
if(!is_null($check_time)){$time_result = $check_time[0]->session_time;}
else{$time_result = time()-2000;}
if(($getinfo[0]->uni_hash != $user_uni_uid)&&(time() - $time_result < 1800)&&(is_user_logged_in()) ){
wp_clearcookie();
myEndSession();
do_action(\'wp_logout\');
nocache_headers();
$redirect_to = home_url();
wp_redirect($redirect_to);
exit();
}else{
myStartSession();
if(!isset($_SESSION["LAST_ACTIVITY"])){$_SESSION["LAST_ACTIVITY"] = time(); }
elseif (time() - $_SESSION["LAST_ACTIVITY"] > 120) {
$_SESSION["LAST_ACTIVITY"] = time();
}
$new_time = $_SESSION["LAST_ACTIVITY"];
$sql = "UPDATE `wp_users` set `session_time`=\'".$new_time."\' WHERE user_login=\'".$ID->user_login."\'";
$wpdb->get_results($sql);
}
}
}
add_action(\'wp_login\', \'myStartSession\', 1);
add_action(\'wp_login\',\'single_user_login_uid_create\');
add_action(\'wp_logout\', \'myEndSession\');
add_action(\'init\',\'single_user_login_uid_check\');
?>
