具有 DatePeriod 迭代的函数在第二次函数调用时缺少一天

我有一个带有以下函数的代码点火器函数：

/**
 * Returns Days within a period of time defined by two DateTime objects
 *
 *
 * @param $start DateTime
 * @param $end DateTime
 * @param $points
 *
 * $return['days'][x]
 */
public function getDaysInRange(DateTime $start,DateTime $end){
    $this->debug(memory_get_usage()/1024,"Memory Usage in KB");
    $this->debug(memory_get_peak_usage()/1024,"Peak Memory Usage in KB");
    $this->debug(memory_get_peak_usage(true)/1024,"Real Peak Memory Usage in KB");
    $interval = new DateInterval('P1D'); // 1Day Interval
    $startC= clone $start;
    $startC->setTime(0,0,0);
    $endC = clone $end;
    $endC->setTime(0,0,0);
    // Workaround because last day of period is not in Iterator
    $endC->add($interval);
    $this->debug($startC,"Get Days in Range Start");
    $this->debug($endC,"Get Days in Range End");
    $daterange = new DatePeriod($startC, $interval,$endC);
    $return = array('days' => array());
    foreach($daterange as $date){
        $this->debug($date->format("Y-m-d"),"Single Day in Daterange");
        $return['days'][] = $date->format("Y-m-d");
    }
    $this->debug($return,"Return of getDays in Range");
    return $return;
}

当我使用不同的 DateTime 对象调用此函数 2 次时。

             [start] => DateTime Object
                        (
                            [date] => 2014-03-01 00:00:00
                            [timezone_type] => 1
                            [timezone] => +00:00
                        )
                    [end] => DateTime Object
                        (
                            [date] => 2014-03-31 00:00:00
                            [timezone_type] => 1
                            [timezone] => +00:00
                        )
       [start] => DateTime Object
                        (
                            [date] => 2014-03-01 00:00:00
                            [timezone_type] => 1
                            [timezone] => +00:00
                        )
                    [end] => DateTime Object
                        (
                            [date] => 2014-03-31 00:00:00
                            [timezone_type] => 1
                            [timezone] => +00:00
                        )

从时间戳创建：

  $begin =   DateTime::createFromFormat('U',  $filter['start'], new DateTimeZone('UTC'));
  $end =   DateTime::createFromFormat('U',  $filter['end'], new DateTimeZone('UTC'));

第一个调用正确返回：

  (
    [days] => Array
(
    [0] => 2014-03-01
    [1] => 2014-03-02
    [2] => 2014-03-03
    [3] => 2014-03-04
    [4] => 2014-03-05
    [5] => 2014-03-06
    [6] => 2014-03-07
    [7] => 2014-03-08
    [8] => 2014-03-09
    [9] => 2014-03-10
    [10] => 2014-03-11
    [11] => 2014-03-12
    [12] => 2014-03-13
    [13] => 2014-03-14
    [14] => 2014-03-15
    [15] => 2014-03-16
    [16] => 2014-03-17
    [17] => 2014-03-18
    [18] => 2014-03-19
    [19] => 2014-03-20
    [20] => 2014-03-21
    [21] => 2014-03-22
    [22] => 2014-03-23
    [23] => 2014-03-24
    [24] => 2014-03-25
    [25] => 2014-03-26
    [26] => 2014-03-27
    [27] => 2014-03-28
    [28] => 2014-03-29
    [29] => 2014-03-30
    [30] => 2014-03-31
)
)

第二次调用重新运行以下内容，滞后于"2014-03-25"

(
    [days] => Array
        (
            [0] => 2014-03-01
            [1] => 2014-03-02
            [2] => 2014-03-03
            [3] => 2014-03-04
            [4] => 2014-03-05
            [5] => 2014-03-06
            [6] => 2014-03-07
            [7] => 2014-03-08
            [8] => 2014-03-09
            [9] => 2014-03-10
            [10] => 2014-03-11
            [11] => 2014-03-12
            [12] => 2014-03-13
            [13] => 2014-03-14
            [14] => 2014-03-15
            [15] => 2014-03-16
            [16] => 2014-03-17
            [17] => 2014-03-18
            [18] => 2014-03-19
            [19] => 2014-03-20
            [20] => 2014-03-21
            [21] => 2014-03-22
            [22] => 2014-03-23
            [23] => 2014-03-24
            [24] => 2014-03-26
            [25] => 2014-03-27
            [26] => 2014-03-28
            [27] => 2014-03-29
            [28] => 2014-03-30
            [29] => 2014-03-31
        )
)

我首先想到的是副作用。我错过了一个吗？

在php中，bugtracker对我的问题没有什么具体的，但是关于DatePeriod奇怪行为的其他一些报告。在服务器上运行一个相当旧的php 5.3.10。

在使用较新版本的 php 重现该错误之前，我尝试在 Codeigniter 之外重现它。在它外面，它正在各种星座中工作。请参阅：http://pastebin.com/FgPTSMEz

因此，我想到了代码点火器环境中可能占用大量内存，这可能会导致错误。但是代码点火器内部的内存使用量仅为4-5 MB。我在独立的测试文件中复制了它，并读取了 5 MB 的文本文件。

目前我不知道问题是什么。