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run code in 300+ PHP versions simultaneously
<?php $a = [ 0 => 'Sun', 1 => 'Mon', 2 => 'Tue', 3 => 'Wed', 4 => 'Thu', 5 => 'Fri', 6 => 'Sat' ]; $start = 0; $r1 = $r2 = []; foreach($a as $k => $v){ ($k >= $start) ? ($r1[$k]=$v) : ($r2[$k]=$v); } $r = $r1 + $r2; print_r($r);

preferences:
15.43 ms | 402 KiB | 5 Q