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To handle login

What we created in the previous tutorial is the login form.
This time, let's handle the login process.
I use a session or a cookie to log in.
I use a session, so I'll proceed with the session.
First, let's create a session file.

htdocs/myProject/include/session.php

<?php
    session_start();
?>

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And now let's create a source that handles login.

htdocs/myProject/member/signIn.php

<?php
    include "../include/session.php";
    include "../include/dbConnect.php";

    $memberId = $_POST['memberId'];
    $memberPw = sha1($memberPw = $_POST['memberPw']);

    $sql = "SELECT * FROM member WHERE userId = '{$memberId}' AND password = '{$memberPw}'";
    $res = $dbConnect->query($sql);

    $row = $res->fetch_array(MYSQLI_ASSOC);

    if($row != null) {
        $_SESSION['ses_userid'] = $row['userId'];
        echo "<script>location.href='/myProject/';</script>";
    }

    if($row == null){
        echo 'Login failure ID and password do not match';
    }
?>

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The above sources don't have to be hard at all. It's surprisingly simple.
Put the ID and password in the SELECT statement and divide them according to whether there is a match.
If so, it creates a session. If not, we don't make it.
Then it is the end.
This is really the end. This will create a session and you will be logged in.
This is the logout function. ^^;

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