Question

我正在尝试创建一个根据用户输入生成动态类属性的类将有一个根据用户输入数据创建的数组。这个数组应该作为一个例子：

$array = array(
    # The boolean values are not relevant in this example
    # The keys are important

    'apple' => true,
    'orange' => false,
    'pear' => false,
    'banana' => true,
);

现在我想用数组键作为类属性创建一个新类：

class Fruit {
    public $apple;
    public $orange;
    public $pear;
    public $banana;

(etc.)
}

我现在必须手动记下所有四个属性有没有办法让它自动化？

Answer 1

<?php

class MyClass 
{
    public function __construct ($config = []) 
    {
        foreach ($config as $key => $value) {
            $this->{$key} = $value;
        }
    }
}

$myClass = new MyClass(['apple' => 1, 'orange' => 2]);

echo $myClass->apple;
?>

这应该可以帮到你

Answer 2

你走了，

我在那里放了一些额外的东西：

class MyClass implements Countable, IteratorAggregate
{
    protected $data = [];

    public function __construct (array $data = []) 
    {
        foreach ($data as $key => $value) {
            $this->{$key} = $value;
        }
    }

    public function __set($key, $value){
        $this->data[$key] = $value;
    }

    public function __get($key)
    {
        if(!isset($this->{$key})) return null; //you could also throw an exception here.
        return $this->data[$key];
    }

    public function __isset($key){
        return isset($this->data[$key]);
    }

    public function __unset($key){
        unset($this->data[$key]);
    }

    public function __call($method, $args){

        $mode = substr($method, 0, 3);
        $property = strtolower(substr($method, 3)); //only lowercase properties
        if(isset($this->{$property})) {
            if($mode == 'set'){
                $this->{$property} = $args[0];
                return null;
            }else if($mode == 'get'){
                return $this->{$property};
            }
        }else{
            return null; //or throw an exception/remove this return
        }
        throw new Exception('Call to undefined method '.__CLASS__.'::'.$method);
    }

    //implement Countable
    public function count(){
        return count($this->data);
    }

    //implementIteratorAggregate
    public function getIterator() {
        return new ArrayIterator($this->data);
    }

}

测试它：

$myClass = new MyClass(['one' => 1, 'two' => 2]);

echo $myClass->two."\n";

//Countable
echo count($myClass)."\n";

//dynamic set
$myClass->three = 3;

echo count($myClass)."\n";

//dynamic get/set methods. I like camel case methods, and lowercase properties. If you don't like that then you can change it.
$myClass->setThree(4);
echo $myClass->getThree()."\n";

//IteratorAggregate
foreach($myClass as $key=>$value){
    echo $key.' => '.$value."\n";
}

输出

2 //value of 2
2 //count of $data
3 //count of $data after adding item
4 //value of 3 after changing it with setThree
//foreach output
one => 1
two => 2
three => 4

Test it online

Disclamer

一般来说，手动定义类更好，这就像IDE的工作方式。您可能也会遇到问题，因为您不一定会提前知道课程中定义的内容。您没有具体的类定义。

几乎所有以__开头的方法（至少在我的代码中）都是一种PHP魔术方法（是的，这是一件事）。当我第一次学会如何使用这些时，我认为它非常酷，但现在我几乎从不使用它们......

现在，如果你想创建一个包含该代码的实际.php文件，那就是另一个对话。（如果您想要功能或实际文件，则不是100％清晰）

干杯。

基于数组值动态分配属性名称

2 个答案: