如何在php中的类方法中返回数组长度？

Question

我有一个数组：

$data = array("a", "b", "c");

我试图在类方法

中打印出这个数组的长度（3）

class MyString {
    public $myChars;
    public $length;

    function __construct($data) {
        $this->myChars = $data;
    }

    function length() {
        $length = count($this->myChars);
        return $length;
    }

来自：

$mystring = new MyString($data);

但这不起作用......

Answer 1

$mystring = new MyString($data);
print $mystring->length();

Answer 2

对班级进行一些修改：

class MyString {
    public $myChars;
    public $length;

    public function __construct($data) {
       $this->myChars = $data;
    }

    public function length() {
       $this->length = count($this->myChars);
       return $this->$length;
    }
}

使用：

$mystring = new MyString($data);
print $mystring->length();