[PHP] What does &var mean ?

[Girish Nath]

Hi

I've been looking at some classes an have come across this notation for
example :

function remove(&$productid) {
/* this function will remove a given product from the cart */
    if (isset($productid)) {
    unset($this->items[$productid]);
    }
}


What does the "&" (ampersand) before the variable name mean ?

Thanks


Girish


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