<?php // Assuming every method call below returns an instance of an object, how can the following be re-written in PHP 5? $a = new MyClass(); $b = $a->getInstance(); $c = $b->doSomething(); /* 1) $c = ((MyClass)$a->getInstance())->doSomething(); 2) This cannot be re-written in PHP 5 3) $c = $a->getInstance()->doSomething(); // PHP 5+ 4) $c = (MyClass)$a->getInstance(); 5) $c = (new MyClass())->getInstance()->doSomething(); // PHP 5.4+ http://php.net/manual/en/migration54.new-features.php */
<?php
include_once __DIR__ . "/../vendor/autoload.php";
use useful\traits\Singleton;
class MyClass
{
use Singleton;
public $hash;
function __construct()
{
$this->hash = md5(rand());
}
}
class MyClass2 extends MyClass
{
use Singleton;
// note: without defining, it will use existent instance of class MyClass
public function getById()
{
}
}
echo MyClass::getInstance()->hash . PHP_EOL;
echo MyClass2::getInstance()->hash . PHP_EOL;