php - How to fix session not starting after unsetting a variable -

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please have been trying fix not working out right me. have session started after logging out using unset($_session['variable'], unable login session not setting.

please me out. note: unable login after unsetting variable. //this login.php

  <?php    session_start();    ob_start();    $msg = "";    if (isset($_post['login'])){        include "dbconnect.php";        if($_session['emaill'] !== null){            $emaill= $_session['emaill'];            $password = $_post['password'];            if (empty($emaill && $password) == false){            $sql = "select * `sono` `email`='$emaill' && `password`='$password'";            $check = mysqli_query($dbconnect, $sql) or die (mysqli_error($dbconnect));            $result = mysqli_num_rows($check);            if ($result > 0){               $emaill= $_session['emaill'];               header ('location: home.php');               exit();               } else               $msg = "<p style='color: red; padding-left: 10px'>invalid password or email address</p>";               } else               $msg = "<p style='color: red; padding-left: 10px'>please enter email , password login</p>";               } else                $msg = "<p style='color: red; padding-left: 10px'>my scripts not working yet</p>";         }        ?>         // logout         <?php          session_start();          if (isset($_session['emaill'])){          unset($_session['emaill']);          header('location: login.php');        }        ?>

before using $_session['emaill'], check isset() : 

if( isset($_session['emaill']) && $_session['emaill'] !== null){ ---- --- }

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