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<?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);
Output for 7.1.25 - 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
Array ( [0] => Sun [1] => Mon [2] => Tue [3] => Wed [4] => Thu [5] => Fri [6] => Sat )

preferences:
128.65 ms | 408 KiB | 5 Q