<"原始数组 :\n";
echo implode(', ',$test_array );
echo "\n排序后数组\n:";
echo implode(', ',counting_sort($test_array, -1, 5)). PHP_EOL;

<"RuntimeException: ".$re->getMessage()."\n";
}
print_r($splfixed->toArray());
}
countSort($arr);
"htmlcode">

class CountSort
{
  private $originalData = [];
  private $rangeMap = [];
  private $resultData = [];

  public function __construct($original = [])
  {
    $this->originalData = $original;
  }

  public function sort()
  {
    list($min, $max) = $this->calculateDataRange();
    $this->statisticNumberOfOccurrence($min, $max);
    $this->resultData = $this->generateResult();
    return $this->resultData;
  }

  protected function calculateDataRange()
  {
    $max = null;
    $min = null;

    foreach ($this->originalData as $value) {
      if (!is_null($max)) {
        if ($value > $max) {
          $max = $value;
        }
      } else {
        $max = $value;
      }

      if (!is_null($min)) {
        if ($value < $min) {
          $min = $value;
        }
      } else {
        $min = $value;
      }
    }

    return [$min, $max];
  }

  protected function statisticNumberOfOccurrence($min, $max)
  {
    for ($i = $min; $i <= $max; $i++) {
      $this->rangeMap[$i] = 0;
    }

    foreach ($this->originalData as $value) {
      $this->rangeMap[$value]++;
    }
  }

  protected function generateResult()
  {
    $result = [];

    foreach ($this->rangeMap as $key => $value) {
      if ($value != 0) {
        for ($i = 0; $i < $value; $i++) {
          array_push($result, $key);
        }
      }
    }
    return $result;
  }
}

$testData = [2, 3, 4, 3, 10, 30, 20, 15, 10, 12, 33];

$countSort = new CountSort($testData);
echo '<pre>';
var_dump($countSort->sort());


输出

<pre>array(11) {

  [0]=>

  int(2)

  [1]=>

  int(3)

  [2]=>

  int(3)

  [3]=>

  int(4)

  [4]=>

  int(10)

  [5]=>

  int(10)

  [6]=>

  int(12)

  [7]=>

  int(15)

  [8]=>

  int(20)

  [9]=>

  int(30)

  [10]=>

  int(33)

}