PHP突然停止工作

以下是我们目前正在进行的网站设计/迁移（MAJOR HEADACHES），从一个直接的PHP/HTML网站迁移到一个基于Drupal的网站。我们有自己的人（也就是我）在做事情，然后我们有设计人员，他们也有第三方在做事情。几周前，我使用了我们旧网站上的一些代码为drupal创建了一个视图，它扫描了一个目录，并列出了目录中关于我们员工报告的所有内容。从那以后，我再也没有碰过它，它一直运行良好，其他6页也是如此。星期四下午，页面突然停止工作，只会呈现一个空白页面。我没有碰过它，据我所知，其他人也没有碰过。我把它与我们的其他页面进行了比较，但我看不出有什么错。我是不是错过了什么？或者这是Drupal的问题？

<?php
$PHP_SELF = '/' . current_path();
$base = DRUPAL_ROOT . "/staff-reports";
$thisyear = date("Y");
# Strip out any HTML tags to eliminate cross-site scripting.
foreach ($_GET as $value) {
    $value = preg_replace("/<(.*?)>/","",$value);
}
# Then grab each GET value into a variable.
foreach ($_GET as $varname => $value) {
    $$varname = $value;
}
# If a year was not specified, use the current year by default.
if (!$year) {
    $year = $thisyear;
}
# List the year folders in the base directory (2001, 2002, et cetera).
if ($handle = opendir($base)) {
    while (false !== ($file = readdir($handle))) {
        // echo $file . '<br />';
        if( is_dir( $base . '/' . $file ) ){
            // echo $file . 'Is a directory <br />';
            if (preg_match("/'d'd'd'd/",$file)) {
                $years[count($years)] = $file;
            }
        }
    }
    closedir($handle);
    rsort($years);
}
# List the target year directory.
$reports = array();
$directory = $base . '/' . $year;
if ($handle = opendir($directory)) {
    while (false !== ($file = readdir($handle))) { 
        if (preg_match("/staff-report-'d'd'd'd-'d'd-'d'd'..../",$file)) {
            $reports[count($reports)] = $file;
        }
    }
    closedir($handle);
    if (count($reports)) {
        sort($reports);
    }
}
print "<table cellpadding='"5'" border='"1'" summary='"Meetings'"><tr valign='"top'">";
# Print the year index in the first column.
print "<td align='"center'"><p><span class='"bold'">Year index</span></p>'n";
for ($i = 0; $i < count($years); $i++) {
    if ($years[$i] == $year) {
        print "<b>";
    }
    print "<a href='"$PHP_SELF?year=$years[$i]'">$years[$i]</a><br />'n";
    if ($years[$i] == $year) {
        print "</b>";
    }
}
print "</td>";
# Print the list of issues for the specified year in the other column.
print "<td align='"center'"><p><span class='"bold'">$year reports</span></p>'n";
if (count($reports)) {
#   print count($reports) . " issues<p>";
    for ($i = 0; $i < count($reports); $i++) {
        $y = substr($reports[$i],13,4);
        $m = substr($reports[$i],18,2);
        $d = substr($reports[$i],21,2);
#       print "<a href='"/staff-reports/$year/$reports[$i]'">$m/$d/$y</a><br />'n";
        print "<a href='"/staff-reports/$year/$reports[$i] ' "> ";
        print date("F j, Y", mktime(0,0,0,$m,$d,$y));
        print "</a><br />'n";
    }
} else {
    print "No reports";
}
print "<br />'n";
print "</td></tr></table>'n";
?>
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<hr />
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?>