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run code in 300+ PHP versions simultaneously
<?php trait A { protected static $_a; public static function setA($a) { static::$_a = $a; } public static function getA() { return static::$_a; } } A::setA('AAAA'); class B { use A; public function __construct() { var_dump(static::$_a); } } A::setA('AAAA'); new B(); B::setA('BBBB'); new B(); echo A::getA(); echo B::getA();

preferences:
33.94 ms | 402 KiB | 5 Q