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並前往https://stackoverflow.com/questions/44625080/php-can-i-leave-a-blank-execution-code-for-if

PHP can I leave a blank execution code for 'If"? - Stack Overflow

you can leave it blank but imho It's better this: if(!in_array($productName, array_keys($_SESSION["cart_item"]))) { $_SESSION['cart_item'] ...

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