为foreach提供的参数无效-建立数据库连接时出错

Question

我的虚拟专用服务器出现问题。VPS托管了2个wordpress网站。从上周开始，服务器有时突然开始产生错误，两个网站都在前端显示了下面的错误。在重新启动Apache but服务器后，1到2天内可以再次正常运行，但这段时间似乎正在减少。

前端产生的错误为：

"Warning: Invalid argument supplied for foreach() in /var/www/html/domainname/wp-includes/locale.php on line 117 Warning: Invalid argument supplied for foreach() in /var/www/html/domainname/wp-includes/locale.php on line 159 Error establishing a database connection"

Locale.php的内容：(没有对此进行任何更改)

function init() {
    // The Weekdays
    $this->weekday[0] = /* translators: weekday */ __('Sunday');
    $this->weekday[1] = /* translators: weekday */ __('Monday');
    $this->weekday[2] = /* translators: weekday */ __('Tuesday');
    $this->weekday[3] = /* translators: weekday */ __('Wednesday');
    $this->weekday[4] = /* translators: weekday */ __('Thursday');
    $this->weekday[5] = /* translators: weekday */ __('Friday');
    $this->weekday[6] = /* translators: weekday */ __('Saturday');

    // The first letter of each day. The _%day%_initial suffix is a hack to make
    // sure the day initials are unique.
    $this->weekday_initial[__('Sunday')]    = /* translators: one-letter abbreviation of the weekday */ __('S_Sunday_initial');
    $this->weekday_initial[__('Monday')]    = /* translators: one-letter abbreviation of the weekday */ __('M_Monday_initial');
    $this->weekday_initial[__('Tuesday')]   = /* translators: one-letter abbreviation of the weekday */ __('T_Tuesday_initial');
    $this->weekday_initial[__('Wednesday')] = /* translators: one-letter abbreviation of the weekday */ __('W_Wednesday_initial');
    $this->weekday_initial[__('Thursday')]  = /* translators: one-letter abbreviation of the weekday */ __('T_Thursday_initial');
    $this->weekday_initial[__('Friday')]    = /* translators: one-letter abbreviation of the weekday */ __('F_Friday_initial');
    $this->weekday_initial[__('Saturday')]  = /* translators: one-letter abbreviation of the weekday */ __('S_Saturday_initial');

    foreach ($this->weekday_initial as $weekday_ => $weekday_initial_) {
        $this->weekday_initial[$weekday_] = preg_replace('/_.+_initial$/', '', $weekday_initial_);
    }

    // Abbreviations for each day.
    $this->weekday_abbrev[__('Sunday')]    = /* translators: three-letter abbreviation of the weekday */ __('Sun');
    $this->weekday_abbrev[__('Monday')]    = /* translators: three-letter abbreviation of the weekday */ __('Mon');
    $this->weekday_abbrev[__('Tuesday')]   = /* translators: three-letter abbreviation of the weekday */ __('Tue');
    $this->weekday_abbrev[__('Wednesday')] = /* translators: three-letter abbreviation of the weekday */ __('Wed');
    $this->weekday_abbrev[__('Thursday')]  = /* translators: three-letter abbreviation of the weekday */ __('Thu');
    $this->weekday_abbrev[__('Friday')]    = /* translators: three-letter abbreviation of the weekday */ __('Fri');
    $this->weekday_abbrev[__('Saturday')]  = /* translators: three-letter abbreviation of the weekday */ __('Sat');

    // The Months
    $this->month['01'] = /* translators: month name */ __('January');
    $this->month['02'] = /* translators: month name */ __('February');
    $this->month['03'] = /* translators: month name */ __('March');
    $this->month['04'] = /* translators: month name */ __('April');
    $this->month['05'] = /* translators: month name */ __('May');
    $this->month['06'] = /* translators: month name */ __('June');
    $this->month['07'] = /* translators: month name */ __('July');
    $this->month['08'] = /* translators: month name */ __('August');
    $this->month['09'] = /* translators: month name */ __('September');
    $this->month['10'] = /* translators: month name */ __('October');
    $this->month['11'] = /* translators: month name */ __('November');
    $this->month['12'] = /* translators: month name */ __('December');

    // Abbreviations for each month. Uses the same hack as above to get around the
    // 'May' duplication.
    $this->month_abbrev[__('January')] = /* translators: three-letter abbreviation of the month */ __('Jan_January_abbreviation');
    $this->month_abbrev[__('February')] = /* translators: three-letter abbreviation of the month */ __('Feb_February_abbreviation');
    $this->month_abbrev[__('March')] = /* translators: three-letter abbreviation of the month */ __('Mar_March_abbreviation');
    $this->month_abbrev[__('April')] = /* translators: three-letter abbreviation of the month */ __('Apr_April_abbreviation');
    $this->month_abbrev[__('May')] = /* translators: three-letter abbreviation of the month */ __('May_May_abbreviation');
    $this->month_abbrev[__('June')] = /* translators: three-letter abbreviation of the month */ __('Jun_June_abbreviation');
    $this->month_abbrev[__('July')] = /* translators: three-letter abbreviation of the month */ __('Jul_July_abbreviation');
    $this->month_abbrev[__('August')] = /* translators: three-letter abbreviation of the month */ __('Aug_August_abbreviation');
    $this->month_abbrev[__('September')] = /* translators: three-letter abbreviation of the month */ __('Sep_September_abbreviation');
    $this->month_abbrev[__('October')] = /* translators: three-letter abbreviation of the month */ __('Oct_October_abbreviation');
    $this->month_abbrev[__('November')] = /* translators: three-letter abbreviation of the month */ __('Nov_November_abbreviation');
    $this->month_abbrev[__('December')] = /* translators: three-letter abbreviation of the month */ __('Dec_December_abbreviation');

    foreach ($this->month_abbrev as $month_ => $month_abbrev_) {
        $this->month_abbrev[$month_] = preg_replace('/_.+_abbreviation$/', '', $month_abbrev_);
    }

我没有改变php或mysql配置中的任何东西，我不知道为什么它会变成这样。

一个临时的解决方案是重新启动httpd服务，然后在大约1天内一切正常，但似乎这一时间正在减少到有时半小时。

起初我认为这个问题是由Mysql引起的。但是，我配置了一个测试工具来测试mysql。在VPS遇到这个问题的时候，通过Mysql测试工具登录到数据库没有问题。

老实说，我不是php大师，希望有人能把我带到正确的轨道上。我自己解决问题和浏览论坛已经有几个小时了，但我现在不知道如何解决这个问题。

如果您需要更多信息，请联系我们。在此之前，非常感谢您。

致以最好的问候，罗伯特

Answer 1

尝试在for循环之前检查它们是否为数组，例如

 if(is_array($this->weekday_initial))
     foreach ($this->weekday_initial as $weekday_ => $weekday_initial_)