Cannot use concatenation when declaring default class properties in PHP?

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For PHP Versions Before 5.6

See http://www.php.net/manual/en/language.oop5.properties.php

They are defined by using one of the keywords public, protected, or private, followed by a normal variable declaration. 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.

For more complex initialisation, use the constructor

public function __construct()
{
    $this->settings = __DIR__ . "https://stackoverflow.com/";
}

PHP 5.6 and Above

As of PHP version 5.6, you can use concatenation when declaring default class properties in PHP. See https://wiki.php.net/rfc/const_scalar_exprs.

This allows places that only take static values (const declarations, property declarations, function arguments, etc) to also be able to take static expressions.

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