3500
250
10049
45394
434
312
       Max value on line graph should probably be 50000
 
493
412
194
783
457 
344
     max value on line graph would ideally be 1000
 
545
649
6854
5485
11545 
      In this case,12000 makes sense as max value

因此,向上舍入到最接近千分之一的简单操作可能会起作用,但随着数字变大,我需要逐渐增加. (在第一个例子中,50000而不是46,000)这些数字的最大值将是大约一百万.

非常感谢任何建议,谢谢.

以下是我的意见,谢谢大家的意见：

private function FigureMaxValue($array)
    {   
      $highestNumber = max($array);
      if ($highestNumber == 0) return 0;
      $highestNumber = $highestNumber * 1.1;
      (float)$highestNumber = round((float)$highestNumber,0); 
      $maxValue = ceil( (integer)$highestNumber / 100 ) * 100;
      return $maxValue;
    }