3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 65; $b = ~$a + 1; // get 2s complement echo $b,"\n"; printf("0x%x\n\n",$b); $c = base_convert($b,10,2); echo $c,"\n"; $i = intval($c,2); echo $i;
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.20, 8.3.0 - 8.3.8
-65 0xffffffffffffffbf Deprecated: Invalid characters passed for attempted conversion, these have been ignored in /in/b7bph on line 6 1000001 65
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
-65 0xffffffffffffffbf 1000001 65

preferences:
179.2 ms | 403 KiB | 231 Q