Created
May 1, 2014 19:52
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| <?php | |
| date_default_timezone_set('UTC'); | |
| function rampupAlgo($x, $start) { | |
| return floor(pow(1.47 * $x, 4) + ($x * $start)); | |
| } | |
| function rampupExponential($start_time, $end_time, $min, $max, $now) { | |
| $diff = $max - $min; | |
| $start_unix = strtotime($start_time); | |
| $end_unix = strtotime($end_time); | |
| $interval = $end_unix - $start_unix; | |
| $days = floor($interval / 3600 / 24); | |
| $current_day = floor(($now - $start_unix) / 3600 / 24); | |
| if ($now > $end_unix) { | |
| return $max; | |
| } | |
| if ($start_unix > $now) { | |
| return $min; | |
| } | |
| // Calc our min / max values for this interval | |
| $y_max = rampupAlgo($days, $min); | |
| $y_min = rampupAlgo(0, $min); | |
| $y_diff = $y_max - $y_min; | |
| // What should we be at right now? | |
| $y_cur = rampupAlgo($current_day, $min); | |
| // try to spread these out over $start -> $end values | |
| // we do this by trying to get a rampup "ratio" | |
| $rampup = round($y_diff / $diff); | |
| $weight = round($y_cur / $rampup); | |
| return $weight; | |
| } | |
| $from_time = '2014-05-1'; | |
| $to_time = '2014-05-21'; | |
| $start = 0; | |
| $end = 100000; | |
| for ($y=0;$y<=21;$y++) { | |
| $now = time() + 3600 * 24 * $y; // add days | |
| echo rampupExponential($from_time, $to_time, $start, $end, $now) . "\n"; | |
| } |
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