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Understanding Callable type in PHP – What does it mean? – Magento

public function aroundPlaceOrder(MagentoQuoteModelQuoteManagement $subject, callable $proceed, $cartId, $paymentMethod = null)

Can anyone tell me what “callable” does?

I can’t find it anywhere else in the code and it’s not setup like a variable like the rest inside this method.

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2

Answers


  1. 0

    It’s the type of the $proceed variable, which means your function accepts a callback function.

    Callbacks can be denoted by callable type hint as of PHP 5.4

    http://php.net/manual/en/language.types.callable.php

    Hope it helps!!

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  2. 0

    Basically, a callable (or callback) it’s like a function that takes another function in argument. So per example.

    function myFunction(Callable $myOtherFunction) {

}

    You would this function like so:

    myFunction(function() {

})
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