diff --git a/blocks/quiz_results/block_quiz_results.php b/blocks/quiz_results/block_quiz_results.php
index 2fe1aca8b46..61901c4a053 100644
--- a/blocks/quiz_results/block_quiz_results.php
+++ b/blocks/quiz_results/block_quiz_results.php
@@ -128,7 +128,7 @@ class block_quiz_results extends block_base {
                     // Count this result only if the user is in a group
                     $groupid = $groupofuser[$grade->userid]->groupid;
                     if(!isset($groupgrades[$groupid])) {
-                        $groupgrades[$groupid] = array('sum' => floatval($grade->grade), 'number' => 1, 'group' => $groupofuser[$grade->userid]->name);
+                        $groupgrades[$groupid] = array('sum' => (float)$grade->grade, 'number' => 1, 'group' => $groupofuser[$grade->userid]->name);
                     }
                     else {
                         $groupgrades[$groupid]['sum'] += $grade->grade;
@@ -187,7 +187,7 @@ class block_quiz_results extends block_base {
                         break;
                         default:
                         case GRADE_FORMAT_PCT:
-                            $this->content->text .= round(floatval($averagegrade) / floatval($quiz->grade) * 100).'%';
+                            $this->content->text .= round((float)$averagegrade / (float)$quiz->grade * 100).'%';
                         break;
                     }
                     $this->content->text .= '</td></tr>';
@@ -212,7 +212,7 @@ class block_quiz_results extends block_base {
                         break;
                         default:
                         case GRADE_FORMAT_PCT:
-                            $this->content->text .= round(floatval($averagegrade) / floatval($quiz->grade) * 100).'%';
+                            $this->content->text .= round((float)$averagegrade / (float)$quiz->grade * 100).'%';
                         break;
                     }
                     $this->content->text .= '</td></tr>';
@@ -299,7 +299,7 @@ class block_quiz_results extends block_base {
                         break;
                         default:
                         case GRADE_FORMAT_PCT:
-                            $this->content->text .= round(floatval($grades[$gradeid]->grade) / floatval($quiz->grade) * 100).'%';
+                            $this->content->text .= round((float)$grades[$gradeid]->grade / (float)$quiz->grade * 100).'%';
                         break;
                     }
                     $this->content->text .= '</td></tr>';
@@ -324,7 +324,7 @@ class block_quiz_results extends block_base {
                         break;
                         default:
                         case GRADE_FORMAT_PCT:
-                            $this->content->text .= round(floatval($grades[$gradeid]->grade) / floatval($quiz->grade) * 100).'%';
+                            $this->content->text .= round((float)$grades[$gradeid]->grade / (float)$quiz->grade * 100).'%';
                         break;
                     }
                     $this->content->text .= '</td></tr>';
diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index bc0eeb76bc8..e0857abd3ee 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -694,10 +694,10 @@ function userdate($date, $format='', $timezone=99, $fixday = true) {
 
     $date += dst_offset_on($date);
     if (abs($timezone) > 13) {
-        $date += intval(date('O') * HOURSECS);
+        $date += intval((float)date('O') * HOURSECS);
     }
     else {
-        $date += intval($timezone * HOURSECS);
+        $date += intval((float)$timezone * HOURSECS);
     }
 
     if ($fixday) {
@@ -728,10 +728,10 @@ function usergetdate($time, $timezone=99) {
     $time += dst_offset_on($time);
 
     if (abs($timezone) > 13) {
-        $time += floatval(date('O')) * HOURSECS;
+        $time += intval((float)(date('O')) * HOURSECS;
     }
     else {
-        $time += floatval($timezone) * HOURSECS;
+        $time += intval((float)($timezone) * HOURSECS;
     }
 
     // This is independent of the server's TZ settings,
diff --git a/mod/quiz/lib.php b/mod/quiz/lib.php
index 1cdfd76bdf0..dbad287cf56 100644
--- a/mod/quiz/lib.php
+++ b/mod/quiz/lib.php
@@ -220,7 +220,7 @@ function quiz_user_outline($course, $user, $mod, $quiz) {
 /// $return->info = a short text description
     if ($grade = get_record('quiz_grades', 'userid', $user->id, 'quiz', $quiz->id)) {
 
-        if (floatval($grade->grade)) {
+        if ((float)$grade->grade) {
             $result->info = get_string('grade').':&nbsp;'.format_float($grade->grade, $quiz->decimalpoints);
         }
         $result->time = $grade->timemodified;