<?php
class A
{
protected static $_instance;
protected function __construct() {}
public static function getInstance()
{
if (self::$_instance === null) {
self::$_instance = new static();
}
return self::$_instance;
}
}
class B extends A {}
echo get_class(B::getInstance());
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
B