diff --git a/ProductComment.php b/ProductComment.php
index bfd38822..70de252f 100644
--- a/ProductComment.php
+++ b/ProductComment.php
@@ -95,6 +95,7 @@ public static function getByProduct($id_product, $p = 1, $n = null, $id_customer
         $validate = (bool) Configuration::get('PRODUCT_COMMENTS_MODERATE');
         $p = (int) $p;
         $n = (int) $n;
+        $id_customer = (int) $id_customer;
         if ($p <= 1) {
             $p = 1;
         }
@@ -102,20 +103,20 @@ public static function getByProduct($id_product, $p = 1, $n = null, $id_customer
             $n = 5;
         }
 
-        $cache_id = 'ProductComment::getByProduct_' . (int) $id_product . '-' . (int) $p . '-' . (int) $n . '-' . (int) $id_customer . '-' . (bool) $validate;
+        $cache_id = 'ProductComment::getByProduct_' . $id_product . '-' . $p . '-' . $n . '-' . $id_customer . '-' . $validate;
         if (!Cache::isStored($cache_id)) {
             $result = Db::getInstance((bool) _PS_USE_SQL_SLAVE_)->executeS('
 			SELECT pc.`id_product_comment`,
-			(SELECT count(*) FROM `' . _DB_PREFIX_ . 'product_comment_usefulness` pcu WHERE pcu.`id_product_comment` = pc.`id_product_comment` AND pcu.`usefulness` = 1) as total_useful,
-			(SELECT count(*) FROM `' . _DB_PREFIX_ . 'product_comment_usefulness` pcu WHERE pcu.`id_product_comment` = pc.`id_product_comment`) as total_advice, ' .
-            ((int) $id_customer ? '(SELECT count(*) FROM `' . _DB_PREFIX_ . 'product_comment_usefulness` pcuc WHERE pcuc.`id_product_comment` = pc.`id_product_comment` AND pcuc.id_customer = ' . (int) $id_customer . ') as customer_advice, ' : '') .
-            ((int) $id_customer ? '(SELECT count(*) FROM `' . _DB_PREFIX_ . 'product_comment_report` pcrc WHERE pcrc.`id_product_comment` = pc.`id_product_comment` AND pcrc.id_customer = ' . (int) $id_customer . ') as customer_report, ' : '') . '
+			(SELECT count(*) FROM `' . _DB_PREFIX_ . 'product_comment_usefulness` pcu WHERE pcu.`id_product_comment` = pc.`id_product_comment` AND pcu.`usefulness` = 1) AS total_useful,
+			(SELECT count(*) FROM `' . _DB_PREFIX_ . 'product_comment_usefulness` pcu WHERE pcu.`id_product_comment` = pc.`id_product_comment`) AS total_advice, ' .
+            ($id_customer ? '(SELECT count(*) FROM `' . _DB_PREFIX_ . 'product_comment_usefulness` pcuc WHERE pcuc.`id_product_comment` = pc.`id_product_comment` AND pcuc.id_customer = ' . $id_customer . ') AS customer_advice, ' : '') .
+            ($id_customer ? '(SELECT count(*) FROM `' . _DB_PREFIX_ . 'product_comment_report` pcrc WHERE pcrc.`id_product_comment` = pc.`id_product_comment` AND pcrc.id_customer = ' . $id_customer . ') AS customer_report, ' : '') . '
 			IF(c.id_customer, CONCAT(c.`firstname`, \' \',  LEFT(c.`lastname`, 1)), pc.customer_name) customer_name, pc.`content`, pc.`grade`, pc.`date_add`, pc.title
 			  FROM `' . _DB_PREFIX_ . 'product_comment` pc
 			LEFT JOIN `' . _DB_PREFIX_ . 'customer` c ON c.`id_customer` = pc.`id_customer`
-			WHERE pc.`id_product` = ' . (int) ($id_product) . ($validate ? ' AND pc.`validate` = 1' : '') . '
+			WHERE pc.`id_product` = ' . $id_product . ($validate ? ' AND pc.`validate` = 1' : '') . '
 			ORDER BY pc.`date_add` DESC
-			' . ($n ? 'LIMIT ' . (int) (($p - 1) * $n) . ', ' . (int) ($n) : ''));
+			' . ($n ? 'LIMIT ' . (($p - 1) * $n) . ', ' . $n : ''));
             Cache::store($cache_id, $result);
         }
 
@@ -169,8 +170,8 @@ public static function getGradeByProduct($id_product, $id_lang)
 		LEFT JOIN `' . _DB_PREFIX_ . 'product_comment_grade` pcg ON (pcg.`id_product_comment` = pc.`id_product_comment`)
 		LEFT JOIN `' . _DB_PREFIX_ . 'product_comment_criterion` pcc ON (pcc.`id_product_comment_criterion` = pcg.`id_product_comment_criterion`)
 		LEFT JOIN `' . _DB_PREFIX_ . 'product_comment_criterion_lang` pccl ON (pccl.`id_product_comment_criterion` = pcg.`id_product_comment_criterion`)
-		WHERE pc.`id_product` = ' . (int) $id_product . '
-		AND pccl.`id_lang` = ' . (int) $id_lang .
+		WHERE pc.`id_product` = ' . $id_product . '
+		AND pccl.`id_lang` = ' . $id_lang .
         ($validate ? ' AND pc.`validate` = 1' : ''));
     }
 
@@ -241,12 +242,12 @@ public static function getCommentNumber($id_product)
             return false;
         }
         $validate = (bool) Configuration::get('PRODUCT_COMMENTS_MODERATE');
-        $cache_id = 'ProductComment::getCommentNumber_' . (int) $id_product . '-' . $validate;
+        $cache_id = 'ProductComment::getCommentNumber_' . $id_product . '-' . $validate;
         if (!Cache::isStored($cache_id)) {
             $result = (int) Db::getInstance((bool) _PS_USE_SQL_SLAVE_)->getValue('
 			SELECT COUNT(`id_product_comment`) AS "nbr"
 			FROM `' . _DB_PREFIX_ . 'product_comment` pc
-			WHERE `id_product` = ' . (int) ($id_product) . ($validate ? ' AND `validate` = 1' : ''));
+			WHERE `id_product` = ' . $id_product . ($validate ? ' AND `validate` = 1' : ''));
             Cache::store($cache_id, (string) $result);
         }
 
@@ -268,7 +269,7 @@ public static function getGradedCommentNumber($id_product)
         $result = Db::getInstance((bool) _PS_USE_SQL_SLAVE_)->getRow('
 		SELECT COUNT(pc.`id_product`) AS nbr
 		FROM `' . _DB_PREFIX_ . 'product_comment` pc
-		WHERE `id_product` = ' . (int) ($id_product) . ($validate == '1' ? ' AND `validate` = 1' : '') . '
+		WHERE `id_product` = ' . $id_product . ($validate == '1' ? ' AND `validate` = 1' : '') . '
 		AND `grade` > 0');
 
         return (int) ($result['nbr']);
@@ -348,7 +349,7 @@ public function validate($validate = '1')
         $success = (Db::getInstance()->execute('
 		UPDATE `' . _DB_PREFIX_ . 'product_comment` SET
 		`validate` = ' . (int) $validate . '
-		WHERE `id_product_comment` = ' . (int) $this->id));
+		WHERE `id_product_comment` = ' . $this->id));
 
         Hook::exec('actionObjectProductCommentValidateAfter', ['object' => $this]);
 
@@ -381,7 +382,7 @@ public static function deleteGrades($id_product_comment)
 
         return Db::getInstance()->execute('
 		DELETE FROM `' . _DB_PREFIX_ . 'product_comment_grade`
-		WHERE `id_product_comment` = ' . (int) $id_product_comment);
+		WHERE `id_product_comment` = ' . $id_product_comment);
     }
 
     /**
@@ -397,7 +398,7 @@ public static function deleteReports($id_product_comment)
 
         return Db::getInstance()->execute('
 		DELETE FROM `' . _DB_PREFIX_ . 'product_comment_report`
-		WHERE `id_product_comment` = ' . (int) $id_product_comment);
+		WHERE `id_product_comment` = ' . $id_product_comment);
     }
 
     /**
@@ -413,7 +414,7 @@ public static function deleteUsefulness($id_product_comment)
 
         return Db::getInstance()->execute('
 		DELETE FROM `' . _DB_PREFIX_ . 'product_comment_usefulness`
-		WHERE `id_product_comment` = ' . (int) $id_product_comment);
+		WHERE `id_product_comment` = ' . $id_product_comment);
     }
 
     /**
diff --git a/ProductCommentCriterion.php b/ProductCommentCriterion.php
index 7c400468..e1c0e538 100644
--- a/ProductCommentCriterion.php
+++ b/ProductCommentCriterion.php
@@ -105,7 +105,7 @@ public function addProduct($id_product)
 
         return Db::getInstance()->execute('
 			INSERT INTO `' . _DB_PREFIX_ . 'product_comment_criterion_product` (`id_product_comment_criterion`, `id_product`)
-			VALUES(' . (int) $this->id . ',' . (int) $id_product . ')
+			VALUES(' . (int) $this->id . ',' . $id_product . ')
 		');
     }
 
@@ -122,7 +122,7 @@ public function addCategory($id_category)
 
         return Db::getInstance()->execute('
 			INSERT INTO `' . _DB_PREFIX_ . 'product_comment_criterion_category` (`id_product_comment_criterion`, `id_category`)
-			VALUES(' . (int) $this->id . ',' . (int) $id_category . ')
+			VALUES(' . (int) $this->id . ',' . $id_category . ')
 		');
     }
 
@@ -145,7 +145,7 @@ public function addGrade($id_product_comment, $grade)
         return Db::getInstance()->execute('
 		INSERT INTO `' . _DB_PREFIX_ . 'product_comment_grade`
 		(`id_product_comment`, `id_product_comment_criterion`, `grade`) VALUES(
-		' . (int) ($id_product_comment) . ',
+		' . $id_product_comment . ',
 		' . (int) $this->id . ',
 		' . (int) ($grade) . ')');
     }
@@ -169,7 +169,7 @@ public static function getByProduct($id_product, $id_lang)
             $alias = 'ps';
         }
 
-        $cache_id = 'ProductCommentCriterion::getByProduct_' . (int) $id_product . '-' . (int) $id_lang;
+        $cache_id = 'ProductCommentCriterion::getByProduct_' . $id_product . '-' . $id_lang;
         if (!Cache::isStored($cache_id)) {
             $result = Db::getInstance()->executeS('
 				SELECT pcc.`id_product_comment_criterion`, pccl.`name`
@@ -177,12 +177,12 @@ public static function getByProduct($id_product, $id_lang)
 				LEFT JOIN `' . _DB_PREFIX_ . 'product_comment_criterion_lang` pccl
 					ON (pcc.id_product_comment_criterion = pccl.id_product_comment_criterion)
 				LEFT JOIN `' . _DB_PREFIX_ . 'product_comment_criterion_product` pccp
-					ON (pcc.`id_product_comment_criterion` = pccp.`id_product_comment_criterion` AND pccp.`id_product` = ' . (int) $id_product . ')
+					ON (pcc.`id_product_comment_criterion` = pccp.`id_product_comment_criterion` AND pccp.`id_product` = ' . $id_product . ')
 				LEFT JOIN `' . _DB_PREFIX_ . 'product_comment_criterion_category` pccc
 					ON (pcc.`id_product_comment_criterion` = pccc.`id_product_comment_criterion`)
 				LEFT JOIN `' . _DB_PREFIX_ . 'product' . $table . '` ' . $alias . '
-					ON (' . $alias . '.id_category_default = pccc.id_category AND ' . $alias . '.id_product = ' . (int) $id_product . ')
-				WHERE pccl.`id_lang` = ' . (int) ($id_lang) . '
+					ON (' . $alias . '.id_category_default = pccc.id_category AND ' . $alias . '.id_product = ' . $id_product . ')
+				WHERE pccl.`id_lang` = ' . $id_lang . '
 				AND (
 					pccp.id_product IS NOT NULL
 					OR ps.id_product IS NOT NULL
@@ -212,7 +212,7 @@ public static function getCriterions($id_lang, $type = false, $active = false)
 			SELECT pcc.`id_product_comment_criterion`, pcc.id_product_comment_criterion_type, pccl.`name`, pcc.active
 			FROM `' . _DB_PREFIX_ . 'product_comment_criterion` pcc
 			JOIN `' . _DB_PREFIX_ . 'product_comment_criterion_lang` pccl ON (pcc.id_product_comment_criterion = pccl.id_product_comment_criterion)
-			WHERE pccl.`id_lang` = ' . (int) $id_lang . ($active ? ' AND active = 1' : '') . ($type ? ' AND id_product_comment_criterion_type = ' . (int) $type : '') . '
+			WHERE pccl.`id_lang` = ' . $id_lang . ($active ? ' AND active = 1' : '') . ($type ? ' AND id_product_comment_criterion_type = ' . (int) $type : '') . '
 			ORDER BY pccl.`name` ASC';
         $criterions = Db::getInstance()->executeS($sql);