How to remove value from array by value

Question

here i am trying to remove value from array, here i am passing action and id to page. i am checking if the values has been set and then perform action.

i want to remove value from array by value. here product_id is the value i am passing and the value has to be removed from array.

for ex:action=remove&product_id=22 the value 22 has to be removed from array

<?php
    if(isset($_GET['action']) && isset($_GET['product_id'])){
        if($_GET['action'] == "add"){
            $product_id = $_GET['product_id'];            
            $_SESSION['cart'][] =$product_id;
        }

        if($_GET['action'] == "remove"){
            unset($_SESSION['cart'][$product_id]);
            echo "product_remove";
        }
    }    
?>

how can i do this?

Use array_search()

Rizier123
– Rizier123

2015-10-06 11:42:56 +00:00
Commented Oct 6, 2015 at 11:42 — Rizier123
– Rizier123, Commented Oct 6, 2015 at 11:42

joan16v · Accepted Answer · 2015-10-06 12:14:17Z

3

if ($_GET['action'] == 'remove') {
    if (array_key_exists($product_id, $_SESSION['cart'])) {
        unset($_SESSION['cart'][$product_id]);
        echo 'product_remove';
    }
}

edited Oct 6, 2015 at 12:14

joan16v

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answered Oct 6, 2015 at 12:02

Alok Kumar Mishra

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Comments

NaijaProgrammer · Accepted Answer · 2015-10-06 11:49:25Z

2

AS @Rizier said in the comment, use array_search, like below:

if($_GET['action'] == "remove"){
   $key = array_search ( $product_id, $_SESSION['cart'] );
   unset($_SESSION['cart'][$key]);
   echo "product_remove";
 }

answered Oct 6, 2015 at 11:49

NaijaProgrammer

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Comments

Fredrik Andersson · Accepted Answer · 2015-10-06 11:50:25Z

1

You could use array_search($product_id, $_SESSION['cart']);

This will get you the key to unset. If you want to unset it the way you do now, you'll have to use the product id as an key when you add to the cart.

Hope this helps!

answered Oct 6, 2015 at 11:50

Fredrik Andersson

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Comments

Alexis Peters · Accepted Answer · 2015-10-06 11:51:49Z

1

you could use array_search() as Rizier123 said, but a more performant way would be using array_flip and deleting by product_id

if($_GET['action'] == "remove"){
   unset(array_flip($_SESSION['cart'])[$product_id]);
   echo "product_remove";
 }

answered Oct 6, 2015 at 11:51

Alexis Peters

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