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<?php
namespace Alxarafe\Core\Base;
use Alxarafe\Core\Utils\ClassUtils;
abstract class Singleton
{
/**
* Hold the classes on instance.
*
* @var array
*/
private static array $instances = [];
public function __construct(string $index = 'main')
$className = self::getClassName();
if (isset(self::$instances[$className][$index])) {
die("Please use '$className:getInstance()' instead of 'new' to instantiate a Singleton.");
exit
In general, usage of exit should be done with care and only when running in a scripting context like a CLI script.
}
self::$instances[$className][$index] = $this;
* Returns the class name.
* @return string
protected static function getClassName(): string
$class = static::class;
return ClassUtils::getShortName($class, $class);
* The object is created from within the class itself only if the class
* has no instance.
* We opted to use an array to make several singletons according to the
* index passed to getInstance
* @param string $index
* @return mixed
public static function getInstance(string $index = 'main')
if (!isset(self::$instances[$className][$index])) {
new static($index);
return self::$instances[$className][$index];
rsanjoseo /
alxarafe
In general, usage of exit should be done with care and only when running in a scripting context like a CLI script.