3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $d = new DateTime(); $d = $d->format("w"); echo $d . " -> " . ($d - 1) % 7 . "\n"; for($i=0; $i <= 7; $i++) echo $i . " -> " . $i%7 . "\n";
based on OkoJt
Output for 5.2.0 - 5.4.32, 5.4.39 - 5.5.24, 5.6.10, 5.6.15, 5.6.18 - 5.6.19, 5.6.21 - 5.6.28, 7.0.2, 7.0.14 - 7.1.0
1 -> 0 0 -> 0 1 -> 1 2 -> 2 3 -> 3 4 -> 4 5 -> 5 6 -> 6 7 -> 0
Output for 5.5.26, 5.5.33, 5.6.12, 7.0.6
2 -> 1 0 -> 0 1 -> 1 2 -> 2 3 -> 3 4 -> 4 5 -> 5 6 -> 6 7 -> 0
Output for 5.5.29, 5.6.17, 5.6.20, 7.0.0, 7.0.5
6 -> 5 0 -> 0 1 -> 1 2 -> 2 3 -> 3 4 -> 4 5 -> 5 6 -> 6 7 -> 0
Output for 5.5.25, 5.5.27, 5.5.30, 7.0.4
4 -> 3 0 -> 0 1 -> 1 2 -> 2 3 -> 3 4 -> 4 5 -> 5 6 -> 6 7 -> 0
Output for 5.6.8, 5.6.11, 5.6.13 - 5.6.14, hhvm-3.12.0, 7.0.3
5 -> 4 0 -> 0 1 -> 1 2 -> 2 3 -> 3 4 -> 4 5 -> 5 6 -> 6 7 -> 0
Output for 5.5.28, 5.5.32, 5.6.7, 5.6.9, 7.0.1
3 -> 2 0 -> 0 1 -> 1 2 -> 2 3 -> 3 4 -> 4 5 -> 5 6 -> 6 7 -> 0
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34 - 5.4.38, 5.5.31, 5.5.34 - 5.5.35, 5.6.16
0 -> -1 0 -> 0 1 -> 1 2 -> 2 3 -> 3 4 -> 4 5 -> 5 6 -> 6 7 -> 0
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/fE90k on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/fE90k on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/fE90k on line 3