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run code in 300+ PHP versions simultaneously
<?php class A {} $a = 'A'; $object = new A; var_dump(is_a('A', 'A')); var_dump(is_a($object, 'A')); var_dump($object instanceof $a);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
bool(false) bool(true) bool(true)

preferences:
103.85 ms | 1617 KiB | 4 Q