How to destroy a session started in php

session_destroy()

It's just a matter of seeing how you will execute the function, and with that the user's session will cease to exist.

For the case that, the tab is closed. You can do it with javascript destroy it if it's started, I'll give you an example:

  

In javascript

$( window ).unload(function() {
  $.post(Ruta donde esta el archivo con el método de borrado de la session);
});

  

In the php

        session_start();
        session_unset();

  

First the function session_start() must be executed < strong> just one   once at the beginning of the whole of your PHP code.

Staying this way:

<?php
session_start(); //Aquí y solo una vez!
include("conexion.php");
    //Variables que recoge lo ingresado x el usuario
    $tab_usu = $_POST["for_nom"];
    $tab_cla = $_POST["for_cla"];
    //Verifica si los campo estan vacios y lo devuelve
    if(empty($tab_usu) || empty($tab_cla)){
        echo"<script>alert('Debe Llenar los campos vacios');window.location.href='index.php';</script>";
    }
    //Consulta Busqueda de un usuario
    $bus_usu = "select apodo_usuario,nombres,apellidos,clave,correo_usuario,correo_recuperacion from usuario where clave='".$tab_cla."' and apodo_usuario='".$tab_usu."' || correo_usuario='".$tab_usu."'";

    //Verifica si el usuario existe
    if($search = mysqli_query($conexion,$bus_usu)){
        $row = mysqli_num_rows($search);
        if($row >= 1){
            //Ciclo que recorre la variable de la consulta
            while($row = mysqli_fetch_assoc($search)){
                //Verifica si se loguea con su apodo_usuario
                if($row["apodo_usuario"] == $tab_usu and $row["clave"] == $tab_cla){

                    $bus_usu = "select concat(nombres,apellidos) from usuario where clave='".$tab_cla."' and apodo_usuario='".$tab_usu."'";
                        $_SESSION["apodo_usuario"] = $tab_usu;
                    echo"<script>alert('Bienvenido $_SESSION[nombres]');window.location.href='index.html';</script>";
                }
                //Verifica si se loguea con su correo_usuario
                else if($row["correo_usuario"] == $tab_usu and $row["clave"] == $tab_cla){

                    $_SESSION["correo_usuario"] = $tab_usu;
                    echo"<script>alert('Bienvenido $_SESSION[correo_usuario]');window.location.href='index.html';</script>";
                }
                //Verifica si al querer ingresar digita erroneamente usuario o contraseña
                else{

                }
            }   
        }
        else{
            echo"<script>alert('Error en los datos ingresados');window.location.href='index.php';</script>";
        }
    }   
?>

  

As you have been told in the comments, you should use    session_destroy() .

To make sure the session_destroy() function is running correctly, use this little PHP script ;

if (session_destroy()) {
    echo "Sesión destruida correctamente";
} else {
    echo "Error al destruir la sesión";
}

I hope it helps you

The best thing you can do to destroy a php session is to start it and then destroy it, something like this:

session_start(); // este por si no la has iniciado en la pagina que planeas destruirla, de lo contrario no te destruirá nada
session_destroy();
session_unset();

with this the whole session should be controlled.

The recommended thing to handle a session is the following step by step: We declare some constants that we will use

if (!defined('SES_COMPANY')) {
    define('SES_COMPANY', 'tusesion');
}

if (!defined('SES_TIMEOUT')){
    define('SES_TIMEOUT'        ,time() + 28800); # 8 Horas
}

Verify if it exists and establish the name:

if(!isset($_SESSION)) { session_name(SES_COMPANY); }

check if it exists again and start the session

if(!isset($_SESSION)) { session_start(); }

check if it exists and indicate the duration time

if(!isset($_SESSION['Ses_TimeOut'])){
    $_SESSION['Ses_TimeOut'] = SES_TIMEOUT;
}

Once built in this way your Session can destroy it in the following way: Verify if it exists and verify if the time expires.

function Ses_TimeOutDest(){
    if(isset($_SESSION['Ses_TimeOut'])){
        if ($_SESSION['Ses_TimeOut']  < time()) {
            session_destroy();
        }
    }
}

You can use the PHP function session_destroy ()

This function destroys the session, if you need to know more about it, I will leave you the following links:

link
link
link