Php session display 2 bootstrap alerts instead one using IF condition - php

Question

I have a page that call "plans.php" and a page that call "register.php". In "plans.php" page i have the code below:
<?php
session_start();
$_SESSION['quarterly'];
$_SESSION['annual'];
?>
**Quarterly submit button**
<form method="post" action="register.php" >
<input type="hidden" name="quarterly" value="">
<input type="submit" class="btn btn-success btn-lg" href="register.php" name="quarterly" value="Quarterly Plan" />
</form>
**Anual submit button**
<form method="post" action="register.php" >
<input type="hidden" name="annual" value="">
<input type="submit" class="btn btn-success btn-lg" href="register.php" name="annual" value="Annual Plan" />
</form>
And in "register.php" page i have the code below:
<?php session_start(); ?>
<?php
if (isset($_SESSION['quarterly'])) {
echo '<div class="alert alert-success" role="alert">You selected Quarterly Plan - CHANGE</div>';
}
if (isset($_SESSION['annual'])) {
echo '<div class="alert alert-success" role="alert">You selected Annual Plan - CHANGE</div>';
}
?>
When user click on quarterly or annual submit button in plans.php page, the register.php page display 2 Bootstrap alerts instead one alert related with user click and, in this same page, when user refresh register.php page, both of alerts continue appear.
I've also tried inserting the code below to see if terminating one of the sessions only shows one alert instead of two but no success:
<?php
if (isset($_SESSION['quarterly'])) {
echo '<div class="alert alert-success" role="alert">You selected Quarterly plan - CHANGE</div>';
session_unset('annual');
}
if (isset($_SESSION['annual'])) {
echo '<div class="alert alert-warning" role="alert">You selected Annual plan - CHANGE</div>';
session_unset('annual');
}
?>
How can i show just one alert without this alert disappear when the same page were refreshed?

Answer 1

The problem is that you are setting those $_SESSION values, so your session will contain them. The solution is to check which of those $_POST is containing via isset. If you want to store this into the session, then you can override the value in $_SESSION for the one which was posted and remove the other.

Answer 2

Simplifying your code.... Try something like that.
Make it simple.
plans.php
<form method="post" action="register.php" >
<input type="submit" class="btn btn-success btn-lg" name="submit" value="Quarterly Plan" />
</form>
<form method="post" action="register.php" >
<input type="submit" class="btn btn-success btn-lg" name="submit" value="Annual Plan" />
</form>
register.php
session_start();
if(isset($_POST['submit'])){
$_SESSION['plan'] = $_POST['submit'] ;
}
if (isset($_SESSION['plan'])){
echo '<div class="alert alert-success" role="alert">You selected '.$_SESSION['plan'].' - CHANGE</div>';
}else{
echo '<div class="alert alert-success" role="alert">You don\'t have any plan, Please - Select</div>';
}
Good programmer always avoid to use much If_Else, Loops, and unnecessary code.