3v4l.org

run code in 300+ PHP versions simultaneously
<?php $bits = 64; $N = 0xfffffffffffffffe; var_dump((int) -(pow(2, $bits) - $N)); // -2
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.31, 5.6.35 - 5.6.40, 7.0.0 - 7.0.9, 7.0.16, 7.0.18 - 7.0.20, 7.0.22 - 7.0.23, 7.0.25 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1, 8.1.24 - 8.1.28, 8.2.11 - 8.2.18, 8.3.0 - 8.3.6
int(0)
Output for 5.6.32 - 5.6.34, 7.0.10 - 7.0.15, 7.0.17, 7.0.21, 7.0.24

Process exited with code 137.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/oL9ZL on line 4
Process exited with code 255.

preferences:
202.2 ms | 401 KiB | 345 Q