如何在php鏈接方法中注入對象？

Question

這是我的php代碼，沒有以正確的方式顯示輸出！ 我錯過了什么？ 最后，在print_r之后顯示正確的方法。 methodB和methodC在鏈接中是可選的，methodC也可以在methodB之前調用。

<?php
class FirstClass
{
    public static $firstArray = Array();
    public static function methodA($a = null)
    {
        self::$firstArray["a"]=$a;
        return new static;
    }
    public function methodB($b = null)
    {
        self::$firstArray["b"]=$b;
        return new static;
    }
    public function methodC($c = null)
    {
        self::$firstArray["c"]=$c;
        return new static;
    }
    public function setSeconClass($sc)
    {
        self::$firstArray["secondClass"]=$sc;
        return self::$firstArray;
    }
}
class SecondClass
{
    public static $secondArray = Array();
    public static function methodA($a = null)
    {
        self::$secondArray["a"]=$a;
        return new static;
    }
    public function methodB($b = null)
    {
        self::$secondArray["b"]=$b;
        return new static;
    }
    public function methodC($c = null)
    {
        self::$secondArray["c"]=$c;
        return new static;
    }
}

$sc = SecondClass::methodA("xxx")->methodB("yyy")->methodC("zzz");
$fc = FirstClass::methodA("qqq")->methodB("www")->methodC("eee")->setSeconClass($sc);
print_r($fc); // outpute should be ---> Array ( [a] => qqq [b] => www [c] => eee [secondClass] => Array ( [a] => xxx [b] => yyy [c] => zzz )) 

$sc = SecondClass::methodA("xxx");
$fc = FirstClass::methodA("qqq")->setSeconClass($sc);
print_r($fc); // outpute should be ---> Array ( [a] => qqq [secondClass] => Array ( [a] => xxx )) 
?>

Answer 1

第一個示例的輸出應為：

Array ( [a] => qqq [b] => www [c] => eee [secondClass] => SecondClass Object ( ) )

...這就是輸出。 因為是SecondClass '方法，你總是返回類是自我 ，從來沒有‘內容’ $secondArray

要獲得輸出，您可以將方法FirstClass::setSeconClass()更改為

public function setSeconClass($sc)
{
    self::$firstArray["secondClass"]=$sc::$secondArray;  // set the array here, not the class
    return self::$firstArray;
}

// OUTPUT:
Array ( [a] => qqq [b] => www [c] => eee [secondClass] => Array ( [a] => xxx [b] => yyy [c] => zzz ) )

或不同地定義$sc ：

$sc = SecondClass::methodA("xxx")->methodB("yyy")->methodC("zzz")::$secondArray;
// again, setting the array as $sc, not the (returned/chained) class

// OUTPUT:
Array ( [a] => qqq [b] => www [c] => eee [secondClass] => Array ( [a] => xxx [b] => yyy [c] => zzz ) )