$(function () {
     $("#login").on("submit", function (e) {
            e.preventDefault();
        $.ajax('ajax/login.php', {
            method: 'POST',
            data: $(this).serialize(),
            dataType: "json",
            success: function(response){
                $('#log').html('Başarılı');
            },
            error: function(response){
                $('#log').html('Başarısız');
            }
        })
    })
});

<?php
include '../class/fonksiyon.php';

if($_POST) {
        $query = $db->prepare("SELECT * FROM psikolog where telefon=:telefon AND sifre=:sifre  LIMIT 1");
        $giris = $query->execute(array(":telefon" => $_POST['telefon'], ":sifre" => $_POST['sifre']));
        $giris = $query->fetch(PDO::FETCH_ASSOC);

        if ($giris) {
            $response = [
                'status' => true
            ];
            $_SESSION['vb']['login'] = 88888;
            $_SESSION['vb']['id'] = $giris['id'];
            $_SESSION['vb']['ad'] = $giris['ad'];
        } else {
            $response = [
                'status' => false
            ];
        }
        echo json_encode($response);
}
?>

setTimeout(function(){                                  
   window.location = "hesabim";
}, 5000);