Online PHP editor | refs for bIF1m

<?php declare(strict_types=1); var_dump( class_exists( 'MySubclass1' ), class_exists( 'MySubclass2' ), class_exists( 'MyAbstract' ) ); // PHP 7.4.9 = FALSE, true, true (PHP 7.3.21 = TRUE, true, true) class MySubclass1 extends MyAbstract{} abstract class MyAbstract{} class MySubclass2 extends MyAbstract{} var_dump( class_exists( 'MySubclass1' ), class_exists( 'MySubclass2' ), class_exists( 'MyAbstract' ) ); // true, true, true