PHP OOP:方法链接 [英] PHP OOP: Method Chaining

问题描述

我有以下代码，

<?php
class Templater
{
    static $params = array();

    public static function assign($name, $value)
    {
        self::$params[] = array($name => $value);
    }

    public static function draw()
    {
        self::$params;
    }
}


 $test = Templater::assign('key', 'value');
 $test = Templater::draw();
 print_r($test);

如何更改此脚本，以便可以使用它?

How can I alter this script so I could use this?

$test = Templater::assign('key', 'value')->assign('key2', 'value2')->draw();
print_r($test);

推荐答案

您不能使用方法链接具有静态方法，因为您不能返回类级别的作用域(return self不会这样做).将您的方法更改为常规方法，并在要允许链接的每个方法中更改return $this.

You cannot use Method Chaining with static methods because you cannot return a class level scope (return self won't do). Change your methods to regular methods and return $this in each method you want to allow chaining from.

请注意，您不应使用T_PAAMAYIM_NEKUDOTAYIM来访问实例方法，因为这会引发E_STRICT通知.使用T_OBJECT_OPERATOR调用实例方法.

Notice that you should not use T_PAAMAYIM_NEKUDOTAYIM to access instance methods as it will raise an E_STRICT Notice. Use T_OBJECT_OPERATOR for calling instance methods.

另请参阅:

• 在PHP中绑定静态方法?

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