类App \ Http \ Controllers \ ConfigClass的对象无法转换为字符串

Question

I have 2 class:

namespace App\Http\Controllers;

class ConfigClass  {
    const ERROR_STATUS = 'kod html [[X]] error';
}

Second class:

use App\Http\Controllers\ConfigClass;

class StatusMessageClass
{

    public function __construct()
    {
        $this->config = new ConfigClass();
    }

    public function createMessageWithStatus(string $messageType, string $description): array
    {
        $classValue = $this->config.'' . $messageType;
        $html = str_replace("[[X]]", $description, $classValue);
        $message = array(
            'messageType' => $messageType,
            'html' => $html,
            'description' => $description
        );
        return $message;
    }

}

And i use this code:

$val = $messageBox->createMessageWithStatus('ERROR_STATUS', "Błędny login lub hasło")

I have error in line (Object of class App\Http\Controllers\ConfigClass could not be converted to string)

$classValue = $this->config.'' . $messageType;

How can i repeir this?

I need this result: $classValue = $this->config::ERROR_STATUS; But I need get this value "ERROR_STATUS" from $messageType in function

Answer 1

Class constants are not supposed to be retrieved from an instance.

So you can get ConfigClass::ERROR_STATUS but not $this->config::ERROR_STATUS.

A workaround is to use get_class() to turn $this->config back into ConfigClass, then you can use the constant() function to retrieve whatever constant is in $messageType:

$classValue = constant(get_class($this->config) . '::' . $messageType);

If you know you will always get the constants from ConfigClass, you can simplify this using the class name (and double quotes for variable interpretation):

$classValue = constant("ConfigClass::$messageType");
// you may need the full namespaced class: \App\Html\Controllers\ConfigClass