3v4l.org

run code in 500+ PHP versions simultaneously
<?php var_dump(STDIN); var_dump(serialize(STDIN)); var_dump(unserialize(serialize(STDIN)));
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
resource(1) of type (stream) string(4) "i:0;" int(0)
preferences:
30.8 ms | 1136 KiB | 7 Q