Question

如何在初始化类之前或初始化时定义变量？

<?php
class class{
 public $var;
 public function __construct(){
  echo $this -> var;
 }
}
$class = new class;
$class -> var = "var";
?>

Answer 1

如果你的意思是实例化类，那么使用构造函数：

class Foo {

    private $_bar;

    public function __construct($value) {
        $this->_bar = $value;
    }

}

$test = new Foo('Mark');

Answer 2

你可以采取两种方式 - 见这个例子：

class bla {
  public static $yourVar;

  public function __construct($var) {
    self::yourVar = $var
  }
}

// you can set it like this without instantiating the class
bla::$yourVar = "lala";

// or pass it to the constructor while it's instantiating
$b = new bla("lala");

第一部分只能用静态做，但如果你不想使用静态，你必须通过构造函数初始化它。

希望这就是你要找的......

Answer 3

$myVariable; // variable is defined

$myVariable = new myClass(); // instance of a class

Answer 4

class myClass {
    protected $theVariable;

    protected function myClass($value) {
        $this->$theVariable = $value;
    }
}


$theVariable = 'The Value';

$theClass = new myClass($theVariable);

echo $theClass->theVariable;

如何在创建类之前定义变量？

4 个答案: