Adding items to a php array without replacing the previous items

Question

Am building a shopping cart and would like to append new items to a wishlist by adding them to a session but they shouldnt replace the existing items

This is what i have tried but returns an error of

[] operator not supported for strings

This is the code:

   public function addItem($value, (int)$id){
   if(isset($_SESSION[$value])){

        $_SESSION[$value][] = array();
        array_push($_SESSION[$value],array(
            'id'=>$id
        ));
        return true;
    }
}

The values of $value is a string

I have also followed on This yii link and also on This link but still am getting the same error

By doing it this way

   public function addItem($value, $id){
   if(isset($_SESSION[$value])){

        $_SESSION[$value] = array();
        array_push($_SESSION[$value],array(
            'id'=>$id
        ));
        return true;
    }
}

Adds the items but replaces whatever i had previously

WHAT DO I NEED TO CHANGE FOR IT TO WORK

what is $value? ur stock ? cause i would suggest u just use $_SESSION['items'][] = Array($id,$value); — KikiTheOne
– KikiTheOne, Commented Nov 23, 2016 at 9:13
“Adds the items but replaces whatever i had previously” – of course it does, if you assign a new empty array to $_SESSION[$value] every time. // $_SESSION is an array already, and you don’t need to initialize “sub-arrays” in PHP, it will create them automatically. So you can simply use $_SESSION[$value][] = 'new item'; to push new items into the array, the initialization with $_SESSION[$value] = array() is unnecessary. — C3roe
– C3roe, Commented Nov 23, 2016 at 9:44

LF-DevJourney · Accepted Answer · 2016-11-23 10:04:52Z

1

You get this error when attempting to use the short array push syntax on a string. demo here.

$_SESSION[$value] is a string. so you cannot use something like $_SESSION[$value][]= 's'

So when the first time you use the $_SESSION[$value], make it an array. Not a string. Then you can use as $_SESSION[$value][]= 's';

edited Nov 23, 2016 at 10:04

answered Nov 23, 2016 at 9:37

LF-DevJourney

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