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<?php //formula: function numSms ($chaCount) { $sms = 1; if($chaCount > 160) { $sms += floor(($chaCount - 160) / 153); //add on the whole number of extra SMSs needed $sms += ceil((($chaCount - 160) % 153) / 153); //with the remainder, work out how many are needed (atypically, just one) } return $sms; } var_dump(numSms(458)); var_dump(numSms(459)); var_dump(numSms(461));

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