3v4l.org

run code in 300+ PHP versions simultaneously
<?php $bits32 = 32; $bits64 = 64; $N32 = 0xfffffffe; $N64 = 0xfffffffffffffffe; $result = -( pow(2, $bits32) - $N32 ); echo $result,"\n"; echo pow(2,$bits32) , "\n",$N32; $result = -( pow(2, $bits64) - $N64 ); echo $result,"\n"; echo pow(2,$bits64), "\n",$N64;
Output for 7.0.2 - 7.0.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
-2 4294967296 4294967294-0 1.844674407371E+19 1.844674407371E+19
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 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 - 5.6.40, 7.0.0 - 7.0.1
-2 4294967296 42949672940 1.844674407371E+19 1.844674407371E+19
preferences:
240.83 ms | 404 KiB | 460 Q