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run code in 300+ PHP versions simultaneously
<?php $d = new DateTime(); $d = $d->format("w"); echo $d . " -> " . ($d - 1) % 7 . "\n"; for($i=0; $i <= 7; $i++) echo $i . " -> " . ($i-1)%7 . "\n";
Output for git.master, git.master_jit, rfc.property-hooks
1 -> 0 0 -> -1 1 -> 0 2 -> 1 3 -> 2 4 -> 3 5 -> 4 6 -> 5 7 -> 6

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