JS Event Listener无限地检查PHP会话

Question

I want my page to consistently check if the user session is still active. if using event listener. My concern is that php file execution time is limited. is there way to set php execution to infinite? or is there a better way of doing this?

JS:

$(document).ready(function() {
    var loginSource = new EventSource("/structure/ajax/check_login_session.php");

    loginSource.addEventListener("login-verification", function(e) {
        var response = JSON.parse(e.data);
        if (data.login_failed) {
            login_fail_redirect();
        }
    });
})

php

function send_response() {

    if (empty($_SESSION['user_info']) || empty($_SESSION['user_info']['active'])) {

        $response = array("status" => "failed", "login_failed" => 1);

    } else {

        $response = array("status" => "success", "login_failed" => 0);

    }

    echo "event: login-verification
";
    echo 'data: '.json_encode($response);
    echo "

";
    flush();

}
while (true) {
    send_response();
    sleep(2);
}

Answer 1

Use a javascript setInterval instead. It will send timed requests to the backend to check if the session is active or not.

$(document).ready(function() {
    setInterval(function {
        var loginSource = new EventSource("/structure/ajax/check_login_session.php");

        loginSource.addEventListener("login-verification", function(e) {
            var response = JSON.parse(e.data);
            if (data.login_failed) {
                login_fail_redirect();
            }
        });
    },1000); //time in ms
})

Then replace this code from your backend:

while (true) {
    send_response();
    sleep(2);
}

to

send_response();