<?php
abstract class T
{
static $instanses;
final private function __construct(){
}
public static function getInstance()
{
if (!isset(static::$instanses)) {
static::$instanses = new static;
}
return static::$instanses;
}
}
class A extends T
{
}
class B extends A
{
}
$t = A::getInstance();
var_dump($t);
$t1 = B::getInstance();
var_dump($t1);
?>
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
object(A)#1 (0) {
}
object(A)#1 (0) {
}