PHP - array_push is replacing instead of add to SESSION Variable - php

Question

<?php
session_start();
$pid = $_GET['pid'];
$ptype = $_GET['ptype'];
$_SESSION = array();
$_SESSION['cart_items'] = array();
if (isset($_GET['add_cart']) && !empty($_GET['add_cart'])) {
// Add new data to Session var
$newdata = array($pid , $ptype, 1 );
array_push($_SESSION['cart_items'], $newdata);
}
echo '<pre>';
var_dump($_SESSION);
echo '</pre>';
?>
array_push replaces the data already in the $_SESSION with $newdata variable in the $_SESSION instead of adding it.
For example:
I enter the url: ?pid=1&ptype=CH-&add_cart=Add+to+Cart
And the array looks like this:
array(1) {
["cart_items"]=>
array(1) {
[0]=>
array(3) {
[0]=>
string(1) "1"
[1]=>
string(3) "CH-"
[2]=>
int(1)
}
}
}
That's great. But when I enter another url like: ?pid=1&ptype=CPU-&add_cart=Add+to+Cart
The array looks like this:
array(1) {
["cart_items"]=>
array(1) {
[0]=>
array(3) {
[0]=>
string(1) "1"
[1]=>
string(4) "CPU-"
[2]=>
int(1)
}
}
}
instead of this:
array(1) {
["cart_items"]=>
array(1) {
[0]=>
array(3) {
[0]=>
string(1) "1"
[1]=>
string(3) "CH-"
[2]=>
int(1)
}
[1]=>
array(3) {
[0]=>
string(1) "1"
[1]=>
string(4) "CPU-"
[2]=>
int(1)
}
}
}
It replaces the data that was already in the Session. I want it to add to it. How do I do so?
Thanks in advance!

Answer 1

change lines 5&6 from
$_SESSION = array();
$_SESSION['cart_items'] = array();
to
// $_SESSION = array();
// $_SESSION['cart_items'] = array();
array_push wasn't clearing your data. those two lines were clearing your session data on every page load.