php - 对 php 对象如何处理数组感到困惑

Question

当我期望“44”时，它的输出是“24”。

class some_class {
    public $array = array();

    public function construct() {
        $this->array[5] = 4;
    }

    public function something() {
        // $this->array at this point is empty, why?
        echo (isset($this->array[5])) ? $this->array[5] : 2;
        $this->array[5] = 4;
        // Here, $this->array holds the value 4 in the key 5 correctly
        echo (isset($this->array[5])) ? $this->array[5] : 2;
    }
}

$some_object = new some_class();
$some_object->something();

知道为什么我的期望被打破了吗？

Answer 1

你的构造函数没有触发它需要被调用:

public function __construct(){
 // constructor
}

否则数组初始化失败。