Online PHP editor | output for jF5Vc

<?php $input = "turn off 499,499 through 500,500"; $lights = [[]]; for($i = 0; $i<1000; $i++){ for($j = 0; $j<1000; $j++){ $lights[$i][$j] = 0; } } $inputs = explode("\n",$input); function action($s){ $on = preg_match("/turn on/",$s); $off = preg_match("/turn off/",$s); $toggle = preg_match("/toggle/",$s); if($on > 0){ return 1; } else if($off>0){ return 2; } else if($toggle>0){ return 3; } } for($i = 0; $i < count($inputs); $i++){ $matches = null; preg_match_all("/\d{1,3},\d{1,3}/",$inputs[$i], $matches); $from = $matches[0][0]; $to = $matches[0][1]; $x1 = explode(",",$from)[0]; $y1 = explode(",",$from)[0]; $x2 = explode(",",$to)[0]; $y2 = explode(",",$to)[1]; for($j = $y1; $j<=$y2; $j++){ for($k = $x1; $k<=$x2; $k++){ if(action($inputs[$i])===1){ $lights[$j][$k] = 1; } else if(action($inputs[$i])===2){ $lights[$j][$k] = 0; } else if(action($inputs[$i])===3){ if($lights[$j][$k] == 0){ $lights[$j][$k] = 1; } else{ $lights[$j][$k] = 0; } } } } } $count = 0; for($i = 0; $i<1000; $i++){ for($j = 0; $j<1000; $j++){ if($lights[$i][$j] == 1){ $count++; } } } echo $count; ?>