How to preserve my session in PHP? - php

Question

I'm making video-portal, so I've authentication system and if I post some comment, or image sessions disapper.
And i Get "Undefined index: email in C:\xampp\htdocs\social_site\assets\login.php on line 2"
AND "Notice: Undefined index: password in C:\xampp\htdocs\social_site\assets\login.php on line 3
".
login.php
<?php
$email = $_POST['email'];
$password = $_POST['password'];
$sql = "SELECT * FROM members WHERE email='$email'";
$query = mysqli_query($conn, $sql);
$row = mysqli_fetch_assoc($query);
$hash_password = $row['password'];
$hash = password_verify( $password, $hash_password);
$y = $_session['username'] = $row['username'];
$x = $_session['id'] = $row['id'];
if (isset($_POST['submit'])) {
if ($hash == 0) {
header('location: index.php?fillpassword');
exit();
}
else{
$sql = "SELECT * FROM members WHERE email='$email' AND password='$hash_password'";
$result = mysqli_query($conn, $sql);
if (!$row = mysqli_fetch_assoc($result)) {
echo "<script>alert('You have no access here. You must login.')</script>";
header ("Location: ../index.php?erorr=noaccess");
}
}
}
?>
main.php
<?php
if ($_SESSION['id'] = $row['id']) {
echo "<form method='POST' action='".setComments($conn)."' enctype='multipart/form-data'>
<input type='hidden' name='size' value='1000000'>
<input type='file' name='image' value='Upload photo'>
<textarea name='text' rows='8' cols='80'></textarea>
<br/>
<input type='submit' name='upload' value='Submit'>
</form>";
}
?>

Answer 1

You have to add a session_start at the begin of your script.
If you don't want to have php's warning when the session is destroyed add also a check to see if the session is still there:
if(isset($_SESSION['password')){ [..] }

Answer 2

Maybe you used dreamweaver , the dreamweaver add hidden some charackters, you can check or remove it by HXD software . Download it from here .