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<?php function getHighway($weight) { switch (true) { case $weight <= 3: $weightsum = $weight * 27; break; case $weight > 3 && $weight <= 6: $weightsum = $weight * 35; break; default: $weightsum = $weight * 55; } //пока не трогаем if ($weightsum < 5) { $weightsum = 5; } if ($weightsum > 500) { $weightsum = 500; } return $weightsum; } var_dump(getHighway(2)); var_dump(getHighway(5)); var_dump(getHighway(10));