与get_class_vars（）一起使用的魔术常量__CLASS__给出错误[重复]

Question

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• Assigning a function's result to a variable within a PHP class? OOP Weirdness 3 answers

Here i have a private variable called vars which is used to store all the variables inside a class.I am using get_class_vars(__CLASS__) to get all the variables.But it gives a parse error.

Parse error: syntax error, unexpected '(', expecting ',' or ';' in C:\xampp\htdocs\practice\bal.php on line 5

if i removed the get_class_vars(__CLASS__) the code works.What might be causing the problem??

class lol{
   static private $message='i am shimantta !! ';
   private $msg='new';
   private $vars=get_class_vars( __CLASS__ );

   public function __get($var){

      echo $this->$var;
   }


}

$lol1=new lol();
$lol1->vars;

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Answer 1

You can't assign 'dynamic' values to class property's in class definition. You can move them in the constructor. Also i think you want $var -> $vars and then it is an array so use print_r() or var_dump(), like this:

class lol {

    static private $message = "i am shimantta !! ";
    private $msg = "new";
    private $vars= "";

    public function __construct() {
        $this->vars = get_class_vars( __CLASS__);
    }

    public function __get($vars){
        print_r($this->$vars);
   }

}

$lol1 = new lol();
$lol1->vars;

For more information about property's see the manual: http://php.net/manual/en/language.oop5.properties.php

And a quote from there:

This declaration may include an initialization, but this initialization must be a constant value--that is, it must be able to be evaluated at compile time and must not depend on run-time information in order to be evaluated.