diff --git a/admin.php b/admin.php
index c01e35937..0499d026f 100644
--- a/admin.php
+++ b/admin.php
@@ -84,20 +84,7 @@ function save_pref ( $prefs, $src ) {
   // Make sure globals values passed to styles.php are for this user.
   // Makes the demo calendar and Page title accurate.
   $GLOBALS['APPLICATION_NAME'] = $s['APPLICATION_NAME'];
-  $GLOBALS['BGCOLOR'] = $s['BGCOLOR'];
-  $GLOBALS['CELLBG'] = $s['CELLBG'];
   $GLOBALS['FONTS'] = $s['FONTS'];
-  $GLOBALS['H2COLOR'] = $s['H2COLOR'];
-  $GLOBALS['HASEVENTSBG'] = $s['HASEVENTSBG'];
-  $GLOBALS['MYEVENTS'] = $s['MYEVENTS'];
-  $GLOBALS['OTHERMONTHBG'] = $s['OTHERMONTHBG'];
-  $GLOBALS['TABLEBG'] = $s['TABLEBG'];
-  $GLOBALS['TEXTCOLOR'] = $s['TEXTCOLOR'];
-  $GLOBALS['THBG'] = $s['THBG'];
-  $GLOBALS['THFG'] = $s['THFG'];
-  $GLOBALS['TODAYCELLBG'] = $s['TODAYCELLBG'];
-  $GLOBALS['WEEKENDBG'] = $s['WEEKENDBG'];
-  $GLOBALS['WEEKNUMBER'] = $s['WEEKNUMBER'];
 
   define_languages(); // Load the language list.
   reset ( $languages );
@@ -127,8 +114,9 @@ function save_pref ( $prefs, $src ) {
 
   $option = '
                 <option value="';
-  $color_sets = $datestyle_md = $datestyle_my = $datestyle_tk = '';
-  $datestyle_ymd = $lang_list = $prefer_vu = '';
+
+  $cch = $color_sets = $datestyle_md = $datestyle_my = $datestyle_tk = '';
+  $datestyle_ymd = $lang_list = $prefer_vu = $rc = '';
   $start_wk_on = $start_wkend_on = $tabs = $user_vu = '';
   $work_hr_end = $work_hr_start = '';
 
@@ -225,10 +213,15 @@ function save_pref ( $prefs, $src ) {
     'POPUP_BG' => translate('Event popup background'),
     'POPUP_FG' => translate('Event popup text')
   ];
+
   foreach ( $colors as $k => $v ) {
-    $handler = 'color_change_handler_' . $k;
-    $color_sets .= print_color_input_html ( $k, $v, '', '', 'p', '', $handler );
+    $GLOBALS[$k] = $s[$k];
+    // Change the color in the current page
+    $cch .= "      function color_change_handler_$k() {\n        var color = $('#admin_' + $k).val();\n\n        $('body').get(0).style.setProperty('--' + $k.toLowerCase, color);\n      }\n";
+    $color_sets .= print_color_input_html ( $k, $v, '', '', 'p', '', 'color_change_handler_' . $k );
+    $rc .= "\n        $('#admin_' + $k).val(" . $GLOBALS[$k] . ");\n        $('body').get(0).style.setProperty('--' + $k.toLowerCase, '" . $GLOBALS[$k] . "');\n";
   }
+
   $csp = ( $s['CSP'] ?: 'none' );
 
   set_today ( date ( 'Ymd' ) );
@@ -852,36 +845,13 @@ function save_pref ( $prefs, $src ) {
       </div>
       <div style="clear:both;">
         <button class="btn btn-primary" name="" type="submit">'
-    . $saveStr . '</button>
+    . $saveStr . "</button>
       </div>
     </form>
-  </div>
-</div>
-</div>';
-
-echo "\n<script>\n";
-
-// Change the color in the current page
-foreach ( $colors as $k => $v ) {
-  echo "function color_change_handler_$k() {\n";
-    echo "  var color = $('#admin_" . $k . "').val();\n";
-    echo "  $('body').get(0).style.setProperty('--" . strtolower($k) . "', color);\n";
-  echo "}\n";
-}
-
-?>
-function reset_colors() {
-  <?php
-    foreach ( $colors as $k => $v ) {
-      echo "  $('body').get(0).style.setProperty('--" . strtolower($k) . "', '$GLOBALS[$k]');\n";
-      echo "  $('#admin_" . $k . "').val('$GLOBALS[$k]');\n";
-    }
-  ?>
-}
-
-</script>
-<?php
-
+    <script>\n" . $cch . "
+      function reset_colors() {" . $rc . '
+      }
+    </script>';
 } else {
   // if $error
   echo print_error ( $error, true );
diff --git a/export.php b/export.php
index a6a7f733a..12186f290 100644
--- a/export.php
+++ b/export.php
@@ -19,7 +19,7 @@
 
 $datem = date ( 'm' );
 $dateY = date ( 'Y' );
-$yearAgo = time () - 365 * 24 * 3600;
+$yearAgo = time () - 31536000; // 365 * 24 * 3600;
 $dateYearAgo = date('Ymd', $yearAgo);
 $selected = ' selected ';
 
diff --git a/import_outlookcsv.php b/import_outlookcsv.php
index b166c0dda..d4315fd70 100644
--- a/import_outlookcsv.php
+++ b/import_outlookcsv.php
@@ -78,7 +78,7 @@ function parse_outlookcsv ( $cal_file ) {
 }
 
 function dateDifference ( $start_timestamp, $end_timestamp, $unit = 0 ) {
-  $days_seconds_star = ( 23 * 56 * 60 ) + 4.091; // Star Day
+  $days_seconds_star = 77284.091; // Star Day ( 23 * 56 * 60 ) + 4.091
   $days_seconds_sun = 86400; // Sun Day
   $difference_seconds = $end_timestamp - $start_timestamp;
   switch ( $unit ) {
diff --git a/includes/classes/Doc.php b/includes/classes/Doc.php
index a37806e04..0394168cf 100644
--- a/includes/classes/Doc.php
+++ b/includes/classes/Doc.php
@@ -19,42 +19,42 @@
  */
 class Doc {
   /**
- * The unique id
+   * The unique id
    * @var int
    * @access private
    */
   var $_blob_id;
 
   /**
- * Associated event's id (if any)
+   * Associated event's id (if any)
    * @var int
    * @access private
    */
   var $_event_id;
 
   /**
- * The user login of user who created this Doc
+   * The user login of user who created this Doc
    * @var string
    * @access private
    */
   var $_login;
 
   /**
- * Filename of the doc (not used for comments)
+   * Filename of the doc (not used for comments)
    * @var string
    * @access private
    */
   var $_name;
 
   /**
- * The description of the doc
+   * The description of the doc
    * @var string
    * @access private
    */
   var $_description;
 
   /**
- * The size of the doc (in bytes)
+   * The size of the doc (in bytes)
    * (not used for comments)
    * @var int
    * @access private
@@ -62,28 +62,28 @@ class Doc {
   var $_size;
 
   /**
- * The MIME type of the doc
+   * The MIME type of the doc
    * @var string
    * @access private
    */
   var $_mime_type;
 
   /**
- * Type of object (C=Comment, A=Attachment)
+   * Type of object (C=Comment, A=Attachment)
    * @var string
    * @access private
    */
   var $_type;
 
   /**
- * Date last modified (in YYYYMMDD format)
+   * Date last modified (in YYYYMMDD format)
    * @var int
    * @access private
    */
   var $_mod_date;
 
   /**
- * Time last modified (in HHMMSS format)
+   * Time last modified (in HHMMSS format)
    * @var int
    * @access private
    */
@@ -314,7 +314,7 @@ function getSummary ($target='') {
     if ( $this->_size < 1024 )
       $ret .= $this->_size . ' ' . translate ( 'bytes' );
     else
-    if ( $this->_size < 1024 * 1024 )
+    if ( $this->_size < 1048576 ) // 1024 * 1024
       $ret .= sprintf ( " %.1f", ( $this->_size / 1024 ) ) . translate ( 'kb' );
     else
       $ret .= sprintf ( " %.1f", ( $this->_size / 1048576 ) ) . translate ( 'Mb' );
diff --git a/includes/functions.php b/includes/functions.php
index f79ffc138..7d98f4e79 100644
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -145,7 +145,7 @@ function add_duration ( $time, $duration ) {
   $minutes =
     intval ( $time / 10000 ) * 60 + ( ( $time / 100 ) % 100 ) + $duration;
   // If we ran past 240000, then roll back over to 000000.
-  $minutes %= ( 24 * 60 );
+  $minutes %= 1440;
 
   return sprintf ( "%d%02d00", $minutes / 60, $minutes % 60 );
 }
@@ -2581,9 +2581,9 @@ function get_groups($user, $includeUserlist=false)
       $res = dbi_execute($sql, [$groups[$i]['cal_group_id']]);
       while ($row = dbi_fetch_row($res)) {
         if (isset($users_by_name[$row[0]])){
-            // It is possible some users assigned to this group may not exist, 
-            // so we skip those that don't. For example, if users are fetched 
-            // from an external source via user-app-*.php, and one of those 
+            // It is possible some users assigned to this group may not exist,
+            // so we skip those that don't. For example, if users are fetched
+            // from an external source via user-app-*.php, and one of those
             // users is deleted externally.
             $users[] = $users_by_name[$row[0]];
         }
@@ -3426,8 +3426,8 @@ function getReminders ( $id, $display = false ) {
         $d = $h = $minutes = 0;
         if ( $reminder['offset'] > 0 ) {
           $minutes = $reminder['offset'];
-          $d = intval ( $minutes / (24*60) );
-          $minutes -= ( $d * (24*60) );
+          $d = intval ( $minutes / 1440 ); // (24*&60)
+          $minutes -= ( $d * 1440 ); // (24*60)
           $h = intval ( $minutes / 60 );
           $minutes -= ( $h * 60 );
         }
diff --git a/includes/moon_phases.php b/includes/moon_phases.php
index d822f2b97..3c08b065b 100644
--- a/includes/moon_phases.php
+++ b/includes/moon_phases.php
@@ -23,15 +23,15 @@ function calculateMoonPhases ( $year, $month = 1 ) {
   $U = false;
 
   $K0 = intval ( ( $year - 1900 ) * 12.3685 ) + ( $month - 1 );
-  $R1 = 3.14159265 / 180;
-  $T = ( $year - 1899.5 ) / 100;
+  $R1 = 0.0174532925; // [pi] 3.14159265 / 180
+  $T  = ( $year - 1899.5 ) / 100;
   $T2 = $T * $T;
   $T3 = $T2 * $T;
 
-  $J0 = 2415020 + 29 * $K0;
+  $J0 = 29 * $K0 + 2415020;
 
   $F0 = ( ( 0.0001178 * $T2 - 0.000000155 * $T3 ) +
-    ( 0.75933 + 0.53058868 * $K0 ) -
+    ( 0.53058868 * $K0 + 0.75933 ) -
     ( 0.000837 * $T + 0.000335 * $T2 ) );
 
   $M0 = $K0 * 0.08084821133;
@@ -53,14 +53,14 @@ function calculateMoonPhases ( $year, $month = 1 ) {
     ( 0.00000239 * $T3 ) );
 
   for ( $K9 = 0; $K9 < 7; $K9 += 0.5 ) {
-    $J = $J0 + 14 * $K9;
+    $J = 14 * $K9 + $J0;
     $K = $K9 / 2;
 
-    $B6 = ( $B1 + $K * 390.67050646 ) * $R1;
-    $M5 = ( $M0 + $K * 29.10535608 ) * $R1;
-    $M6 = ( $M1 + $K * 385.81691806 ) * $R1;
+    $B6 = ( $K * 390.67050646 + $B1 ) * $R1;
+    $M5 = ( $K * 29.10535608 + $M0 ) * $R1;
+    $M6 = ( $K * 385.81691806 + $M1 ) * $R1;
 
-    $F = ( ( $F0 + 0.765294 * $K9 ) -
+    $F = ( ( 0.765294 * $K9 + $F0 ) -
       ( 0.4068 * sin ( $M6 ) ) +
       ( ( 0.1734 - 0.000393 * $T ) * sin ( $M5 ) ) +
       ( 0.0161 * sin ( 2 * $M6 ) ) +
@@ -73,7 +73,7 @@ function calculateMoonPhases ( $year, $month = 1 ) {
 
     $J += intval ( $F );
     $F -= intval ( $F );
-    //.
+
     // Convert from JD to Calendar Date.
     $julian = $J + round ( $F );
     $s = ( function_exists ( 'jdtogregorian' )
diff --git a/purge.php b/purge.php
index d1cacc9af..b6f2b5d89 100644
--- a/purge.php
+++ b/purge.php
@@ -193,11 +193,9 @@ function purge_events ( $ids ) {
     ['webcal_entry', 'cal_id']];
 
   //var_dump($tables);exit;
-  $num = [];
   $cnt = count ( $tables );
-  for ( $i = 0; $i < $cnt; $i++ ) {
-    $num[$i] = 0;
-  }
+  $num = array_fill ( 0, $cnt, 0 );
+  
   foreach ( $ids as $cal_id ) {
     for ( $i = 0; $i < $cnt; $i++ ) {
       $clause = ( $cal_id == 'ALL' ? '' :
diff --git a/search.php b/search.php
index 622efdd6d..78580b121 100644
--- a/search.php
+++ b/search.php
@@ -92,8 +92,8 @@
           </td></tr>';
 }
 if ($show_advanced) {
-  $startDateYmd = date('Ymd', time() - (90 * 24 * 3600)); // 90 days ago
-  $endDateYmd = date('Y-m-d', time() + (90 * 24 * 3600)); // 90 days from now
+  $startDateYmd = date ( 'Ymd', time() - 7776000 ); // 90 days ago
+  $endDateYmd = date ( 'Y-m-d', time() + 7776000 ); // 90 days from now
   echo '<tr id="datefilter">
           <td><label for="date_filter" class="colon">' . translate('Filter by Date')
    . ':</label></td>