Question

假设我有这些课程：

abstract class AbstractEntity {
    function __construct($args = array()) {
        foreach ($args as $property => $value) {
            $this->{$property} = $value;
        }
    }

    public function __get( $property ) {
        if( isset( $this->{$property} ) ) {
            return $this->{$property};
        } else {
           throw new \Exception( 'Porperty ' . $property . ' not found!' );
        }
    }
    public function __set($property, $value) {
        if( isset( $this->{$property} ) ) {
            $this->{$property} = $value;
        } else {
            throw new \Exception( 'Porperty ' . $property . ' not found!' );
        }
    }
}

class Person extends AbstractEntity {
    protected $name;
}

class Group extends AbstractEntity  {
    protected $people; // array of Person
}

现在我想在循环中用$people个对象填充Person属性，例如：

$group = new Group( array( 'people' => array() ) );

foreach ( get_people_data() as $person_data ) {
    $group->people[] = new Person( $person_data['name'] );
}

但这不起作用，我收到错误：

Notice: Indirect modification of overloaded property Group::$people has no effect in ...

我知道我可以使用临时数组，用Person个对象填充它然后将它分配给$people属性，但我有点不喜欢它...所以，是否有任何其他解决方案？

Answer 1

尝试公开$ people属性。它适用于我的情况。

[...]
public $people = array(); // array of Person
[...]

$group->people[] = new Person( 1);
$group->people[] = new Person( 2);

Answer 2

你的代码看起来有些不完整，这就是我的假设，看看它是怎么回事......

<?php

class Person {
    public $name;
    function __construct($n)
    {
        $this->name=$n;
    }
}

class Group {
public $people = array(); // array of Person
}

$arr = [0=>['name'=>'John'],1=>['name'=>'Jack'],2=>['name'=>'Jill']];
$group = new Group();
foreach ($arr as $person_data ) {
    $group->people[] = new Person( $person_data['name'] );
}
print_r($group->people);

<强> OUTPUT :

Array
(
    [0] => Person Object
        (
            [name] => John
        )

    [1] => Person Object
        (
            [name] => Jack
        )

    [2] => Person Object
        (
            [name] => Jill
        )

)

Answer 3

最后我在我的AbstractEntity课程中添加了一个功能，允许将$value添加到课程的$property，该array必须是public function append_to( $property, $value ) { // Check that $property exists on the object and is an array if( isset( $this->{$property} ) && is_array( $this->{$property} ) ) { $this->{$property}[] = $value; } else { throw new \Exception( 'Porperty ' . $property . ' not found or is not array!' ); } }：

public

这些（在我看来）比其他方法有一些好处：

我不需要制作任何字段addPerson()。
我不必创建像AbstractEntity这样的函数，所以我可以将所有类扩展{{1}}作为一组简单的属性，而不需要任何函数。

将元素添加到作为对象属性的数组

3 个答案: