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JOSE HERRADA
Asked: 2020-12-11 08:44:48 +0800 CST 2020-12-11 08:44:48 +0800 CST

Fatal error: Constant expression contains invalid operations in

  • 772

Fatal error: Constant expression contains invalid operations in C:\xampp\htdocs\test\php_tests\app\controller\auth\Token.php on line 18

protected $token = [

        'csrf' => random_int(0, 500) // line 18
    ];

Hi, that is the error that I get. I need that space to generate a random number but it gives me an error

php

1 Answers

  1. Best Answer

    Your code should look like this:

    <?php

class Demo
{
    protected $token;
    public function aleatorio()
    {
        return $this->token = random_int(100,200);
    }
}

$obj = new Demo();

echo $obj->aleatorio();

    Resulting, for example:

    120, 150 or any other number in that range from 100 to 200

    Explanation

    From what I see the error could be generated because you are trying to assign a dynamic value to a property of the class

    Option 1

    • The property must have a fixed value assigned in order to work, for example:
    protected $token = 100;

    Option 2

    • Declares the property without an assigned value
    • Declare a method and return the property tokenwithin it by matching it to the dynamic result offered by the methodrandom_int()
    • Generates an instance of the class with the object$obj
    • prints to the screen what the object $objaccessing the method aleatorio()returns
    • 2