作爲函數參數的非原始類的PHP數組

Question

我在想（如果可能）你將如何聲明一個非原始類的數組作爲函數參數。例如

<?php 
class C {} 

function f(array C $c) { 
    /* use $c[1], $c[2]... */ 
} 

Answer 1

幫主 - 目前不能鍵入提示參數作爲array of something。

所以，你的選項有：

// just a function with some argument, 
// you have to check whether it is array 
// and whether each item in this array has type `C` 
function f($c) {} 

// function, which argument MUST be array. 
// if it is not array - error happens 
// you still have to check whether 
// each item in this array has type `C` 
function f(array $c) {} 

// function, which argument of type CCollection 
// So you have to define some class CCollection 
// object of this class can store only `C` objects 
function f(CCollection $c) {} 

// class CCollection can be something like 
class CCollection 
{ 
    private $storage = []; 

    function addItem(C $item) 
    { 
     $this->storage[] = $item; 
    } 

    function getItems() 
    { 
     return $this->storage; 
    } 
}