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$test_nums = $total_nums > 180 ? $test_nums
           : $total_nums > 150 ? 6
...
           : $total_nums >  60 ? 3
           : $total_nums >  30 ? 2
           :                     1;

if ( $total_nums <= 0 ) {
   $test_nums = 1;
} elsif ( $total_nums <= 180 ) {
   $test_nums = int( ( $total_nums - 1 ) / 30 ) + 1;
}