<?php
class A
{
protected static $foo = 'foo';
public function saySelfFoo()
{
echo self::$foo . PHP_EOL;
}
public function sayStaticFoo()
{
echo static::$foo . PHP_EOL;
}
}
class B extends A
{
protected static $foo = 'bar';
}
$a = new A();
$b = new B();
$a->saySelfFoo();
$b->saySelfFoo();
$a->sayStaticFoo();
$b->sayStaticFoo();
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
foo
foo
foo
bar