diff --git a/src/Database/Manager.php b/src/Database/Manager.php
index b3a77e2..036710c 100644
--- a/src/Database/Manager.php
+++ b/src/Database/Manager.php
@@ -122,7 +122,7 @@ class Database_Manager
 		if (isset($data['references'])) {
 			$references = " REFERENCES ".$data['references'];
 		}
-		if (isset($data["not_null"])&&$data["not_null"])
+		if (isset($data["not_null"]) && $data["not_null"])
 			$constraint .=" NOT NULL";
 		$type = $data['type'];
 		if (!$pg) {
diff --git a/src/Tools/SQLStatementExtractor.php b/src/Tools/SQLStatementExtractor.php
index 551ee85..180d779 100644
--- a/src/Tools/SQLStatementExtractor.php
+++ b/src/Tools/SQLStatementExtractor.php
@@ -121,7 +121,7 @@ class Tools_SQLStatementExtractor {
      * @param string $string The string to check in (haystack).
      * @return boolean True if $string ends with $check, or they are equal, or $check is empty.
      */
-    protected static function endsWith($check, $string) {
+    protected static function endsWith(/*.string.*/$check, $string) {
         if ($check === "" || $check === $string) {
             return true;
         } else {
diff --git a/src/Validator/Rule/IsFile.php b/src/Validator/Rule/IsFile.php
index 64d5f97..b724754 100644
--- a/src/Validator/Rule/IsFile.php
+++ b/src/Validator/Rule/IsFile.php
@@ -38,7 +38,7 @@ class Validator_Rule_IsFile extends Validator_Rule_Abstract
             return false;    
         }
 
-        if ($tmp['size'] > $this->maxsize*1024) {
+        if (((int)$tmp['size']) > $this->maxsize*1024) {
             $this->setErrorMsg('Неверный размер файла');
             return false;    
         }