<?php
class Aareon_Abstract
{
public static $instance;
public static function getInstance() {
if (self::$instance === null) {
self::$instance = new static();
}
return self::$instance;
}
}
class Aareon_MaterializedView extends Aareon_Abstract
{
public static $instance;
}
class Sample extends Aareon_Abstract
{
}
echo get_class(Aareon_Abstract::getInstance()) . PHP_EOL;
echo get_class(Aareon_MaterializedView::getInstance()) . PHP_EOL; //As you can see, a new B is instantiated here, because B::$instance is a priority over A::$instance.
echo get_class(Aareon_Abstract::getInstance()) . PHP_EOL;
A::$instance = null;
echo PHP_EOL;
echo get_class(Aareon_Abstract::getInstance()) . PHP_EOL;
echo get_class(Sample::getInstance()) . PHP_EOL; //But here, there is no C::$instance, so let's check the A::$instance which is not empty.
echo get_class(Aareon_Abstract::getInstance()) . PHP_EOL;
Aareon_Abstract
Aareon_Abstract
Aareon_Abstract
Fatal error: Uncaught Error: Class "A" not found in /in/HfZlr:28
Stack trace:
#0 {main}
thrown in /in/HfZlr on line 28
Process exited with code 255.
Aareon_Abstract
Aareon_Abstract
Aareon_Abstract
Fatal error: Uncaught Error: Class 'A' not found in /in/HfZlr:28
Stack trace:
#0 {main}
thrown in /in/HfZlr on line 28
Process exited with code 255.