Updating Userprofile - php

Question

I have a session.php and a welcome.php page. There I have my userprofile.
I am trying to update the email field.
When I change my email address and press the update button I get the echo Update Successful, but it does not update. I think it still has the old value from the session and I need to clear it.
session.php:
<?php
include('connection.php');
session_start();
$user_check = $_SESSION['login_user'];
$ses_sql = mysqli_query($db,"select * from clients where email = '$user_check'");
$row = mysqli_fetch_array($ses_sql,MYSQLI_ASSOC);
$_SESSION['email']= $row['email'];
$_SESSION['username']= $row['username'];
$_SESSION['firstname']= $row['firstname'];
$_SESSION['lastname']= $row['lastname'];
$_SESSION['birthdate']= $row['birthdate'];
$_SESSION['street']= $row['street'];
$_SESSION['streetnr']= $row['streetnr'];
$_SESSION['city']= $row['city'];
$_SESSION['plzz']= $row['plzz'];
if(!isset($_SESSION['login_user'])){
header("
location:http://localhost:81/Left_over_youth_website/pages/login.php");
}
?>
welcome.php:
<?php
include("../php/session.php");
?>
<div>
<div class="col-md-9">
<div class="imagepageback">
<div class="card">
<div class="profilimage"></div>
<hr class="verticalline">
<?php
$sql = "UPDATE clients SET emaill = $_SESSION WHERE email = $user_check";
$update = mysqli_query($db, $sql);
if($update){
echo("update sucessful");
$_SESSION["emaill"] = $email_session;
}
?>
<form class="form" action="" method="post">
<input id="usernamee" class="usernamee" type="text" name="username" value="<?php echo $_SESSION['username']; ?>" readonly>
<input id="emaill" class="emaill" type="text" name="email" value="<?php echo $_SESSION['email']; ?>" readonly>
<input id="firstnamee" class="firstnamee" type="text" name="firstname" value="<?php echo $_SESSION['firstname']; ?>" readonly>
<input id="lastnamee" class="lastnamee" type="text" name="lastname" value="<?php echo $_SESSION['lastname']; ?>" readonly>
<input id="birthdatee" class="birthdatee" type="text" name="birthdate" value="<?php echo $SESSION['birthdate']; ?>" readonly>
<div>
<input id="streett" class="streett" type="text" name="street" value="<?php echo $_SESSION['street']; ?>" readonly>
<input id="nrr" class="nrr" type="text" name="streetnr" value="<?php echo $_SESSION['streetnr']; ?>" readonly>
</div>
<div>
<input id="cityy" class="cityy" type="text" name="city" value="<?php echo $_SESSION['city']; ?>" readonly>
<input id="plzz" class="plzz" type="text" name="plzz" value="<?php echo $_SESSION['plzz']; ?>" readonly>
</div>
<a href="#" class="editprofilelink" id="editprofilelink" onclick="editable(); showbt()"; >Edit Profile</a>
Change Password
<input hidden id="btupdate" type="submit" name="btupdate" value="Update">
</form>
</div>
</div>
</div>
</div>
</div>

Answer 1

echo 'update successful' on update query.
Try the following.
in welcome.php:
<?php
if(isset($_POST['btupdate'])){
$email = $_REQUEST['email'];
$sql = "UPDATE clients SET emaill = '$email' WHERE email = '$email_session'";
$update = mysqli_query($db, $sql);
if($update)
{
echo("update successful");
}
?>

Answer 2

You have a fatal error over this code:
<?php
$email = "SELECT * From Clients";
$sql = "UPDATE clients". "SET emaill = $email". "WHERE email = $email_session";
if(isset($_POST['btupdate'])){
$update = mysqli_query($db, $sql);
echo("update sucessful");
}
?>
this part ("UPDATE clients". "SET emaill = $email". "WHERE email = $email_session") returns this string "UPDATE clientsSET emaill = example#example.comWHERE email = example2#example.com
try this instead:
$sql="UPDATE clients SET emaill = $email WHERE email = $email_session"
be careful when using concatinate it won't add any space for you.
And you are not changing the $_SESSION["email"] after changing it. you must add $_SESSION["email"] = $email;
<?php
$email = "SELECT * From Clients";
$sql = "UPDATE clients SET emaill = $email WHERE email = $email_session";
$update = mysqli_query($db, $sql);
if($update){
echo("update sucessful");
}
?>