diff --git a/lib/Data/AbstractData.php b/lib/Data/AbstractData.php
index cc726aaa..aec99f76 100644
--- a/lib/Data/AbstractData.php
+++ b/lib/Data/AbstractData.php
@@ -72,7 +72,7 @@ abstract class AbstractData
      * @param  array  $paste
      * @return bool
      */
-    abstract public function create(string $pasteid, array $paste);
+    abstract public function create($pasteid, array $paste);
 
     /**
      * Read a paste.
@@ -81,7 +81,7 @@ abstract class AbstractData
      * @param  string $pasteid
      * @return stdClass|false
      */
-    abstract public function read(string $pasteid);
+    abstract public function read($pasteid);
 
     /**
      * Delete a paste and its discussion.
@@ -89,7 +89,7 @@ abstract class AbstractData
      * @access public
      * @param  string $pasteid
      */
-    abstract public function delete(string $pasteid);
+    abstract public function delete($pasteid);
 
     /**
      * Test if a paste exists.
@@ -98,7 +98,7 @@ abstract class AbstractData
      * @param  string $pasteid
      * @return bool
      */
-    abstract public function exists(string $pasteid);
+    abstract public function exists($pasteid);
 
     /**
      * Create a comment in a paste.
@@ -110,7 +110,7 @@ abstract class AbstractData
      * @param  array  $comment
      * @return bool
      */
-    abstract public function createComment(string $pasteid, string $parentid, string $commentid, array $comment);
+    abstract public function createComment($pasteid, $parentid, $commentid, array $comment);
 
     /**
      * Read all comments of paste.
@@ -119,7 +119,7 @@ abstract class AbstractData
      * @param  string $pasteid
      * @return array
      */
-    abstract public function readComments(string $pasteid);
+    abstract public function readComments($pasteid);
 
     /**
      * Test if a comment exists.
@@ -130,7 +130,7 @@ abstract class AbstractData
      * @param  string $commentid
      * @return bool
      */
-    abstract public function existsComment(string $pasteid, string $parentid, string $commentid);
+    abstract public function existsComment($pasteid, $parentid, $commentid);
 
     /**
      * Returns up to batch size number of paste ids that have expired
@@ -139,7 +139,7 @@ abstract class AbstractData
      * @param  int $batchsize
      * @return array
      */
-    abstract protected function _getExpiredPastes(int $batchsize);
+    abstract protected function _getExpiredPastes($batchsize);
 
     /**
      * Perform a purge of old pastes, at most the given batchsize is deleted.
diff --git a/lib/Data/Database.php b/lib/Data/Database.php
index 18efecc4..bba53f18 100644
--- a/lib/Data/Database.php
+++ b/lib/Data/Database.php
@@ -154,7 +154,7 @@ class Database extends AbstractData
      * @param  array  $paste
      * @return bool
      */
-    public function create(string $pasteid, array $paste)
+    public function create($pasteid, array $paste)
     {
         if (
             array_key_exists($pasteid, self::$_cache)
@@ -223,7 +223,7 @@ class Database extends AbstractData
      * @param  string $pasteid
      * @return array|false
      */
-    public function read(string $pasteid)
+    public function read($pasteid)
     {
         if (array_key_exists($pasteid, self::$_cache)) {
             return self::$_cache[$pasteid];
@@ -287,7 +287,7 @@ class Database extends AbstractData
      * @access public
      * @param  string $pasteid
      */
-    public function delete(string $pasteid)
+    public function delete($pasteid)
     {
         self::_exec(
             'DELETE FROM ' . self::_sanitizeIdentifier('paste') .
@@ -311,7 +311,7 @@ class Database extends AbstractData
      * @param  string $pasteid
      * @return bool
      */
-    public function exists(string $pasteid)
+    public function exists($pasteid)
     {
         if (
             !array_key_exists($pasteid, self::$_cache)
@@ -331,7 +331,7 @@ class Database extends AbstractData
      * @param  array  $comment
      * @return bool
      */
-    public function createComment(string $pasteid, string $parentid, string $commentid, array $comment)
+    public function createComment($pasteid, $parentid, $commentid, array $comment)
     {
         if (array_key_exists('data', $comment)) {
             $version = 1;
@@ -370,7 +370,7 @@ class Database extends AbstractData
      * @param  string $pasteid
      * @return array
      */
-    public function readComments(string $pasteid)
+    public function readComments($pasteid)
     {
         $rows = self::_select(
             'SELECT * FROM ' . self::_sanitizeIdentifier('comment') .
@@ -414,7 +414,7 @@ class Database extends AbstractData
      * @param  string $commentid
      * @return bool
      */
-    public function existsComment(string $pasteid, string $parentid, string $commentid)
+    public function existsComment($pasteid, $parentid, $commentid)
     {
         return (bool) self::_select(
             'SELECT dataid FROM ' . self::_sanitizeIdentifier('comment') .
@@ -456,7 +456,7 @@ class Database extends AbstractData
      * @throws PDOException
      * @return bool
      */
-    private static function _exec(string $sql, array $params)
+    private static function _exec($sql, array $params)
     {
         $statement = self::$_db->prepare($sql);
         $result    = $statement->execute($params);
@@ -475,7 +475,7 @@ class Database extends AbstractData
      * @throws PDOException
      * @return array
      */
-    private static function _select(string $sql, array $params, bool $firstOnly = false)
+    private static function _select($sql, array $params, bool $firstOnly = false)
     {
         $statement = self::$_db->prepare($sql);
         $statement->execute($params);
diff --git a/lib/Data/Filesystem.php b/lib/Data/Filesystem.php
index a19408da..736b61d5 100644
--- a/lib/Data/Filesystem.php
+++ b/lib/Data/Filesystem.php
@@ -29,7 +29,7 @@ class Filesystem extends AbstractData
      * @param  array $options
      * @return Filesystem
      */
-    public static function getInstance($options = null)
+    public static function getInstance(array $options)
     {
         // if needed initialize the singleton
         if (!(self::$_instance instanceof self)) {
@@ -53,7 +53,7 @@ class Filesystem extends AbstractData
      * @param  array  $paste
      * @return bool
      */
-    public function create($pasteid, $paste)
+    public function create($pasteid, array $paste)
     {
         $storagedir = self::_dataid2path($pasteid);
         $file       = $storagedir . $pasteid . '.php';
@@ -121,7 +121,7 @@ class Filesystem extends AbstractData
      * @param  string $pasteid
      * @return bool
      */
-    public function exists($pasteid)
+    public functio(($pasteid)
     {
         $basePath  = self::_dataid2path($pasteid) . $pasteid;
         $pastePath = $basePath . '.php';
@@ -155,7 +155,7 @@ class Filesystem extends AbstractData
      * @param  array  $comment
      * @return bool
      */
-    public function createComment($pasteid, $parentid, $commentid, $comment)
+    public function createComment($pasteid, $parentid, $commentid, array $comment)
     {
         $storagedir = self::_dataid2discussionpath($pasteid);
         $file       = $storagedir . $pasteid . '.' . $commentid . '.' . $parentid . '.php';
@@ -230,7 +230,7 @@ class Filesystem extends AbstractData
      * @param  int $batchsize
      * @return array
      */
-    protected function _getExpiredPastes($batchsize)
+    protected function _getExpiredPastes(int $batchsize)
     {
         $pastes     = array();
         $mainpath   = DataStore::getPath();
diff --git a/tst/Bootstrap.php b/tst/Bootstrap.php
index 8a4f7cb9..21e031cb 100644
--- a/tst/Bootstrap.php
+++ b/tst/Bootstrap.php
@@ -3,6 +3,7 @@
 use PrivateBin\Persistence\ServerSalt;
 
 error_reporting(E_ALL | E_STRICT);
+ini_set('display_errors', 1);
 
 // change this, if your php files and data is outside of your webservers document root
 if (!defined('PUBLIC_PATH')) {
@@ -120,7 +121,7 @@ class Helper
      * @param  array $meta
      * @return array
      */
-    public static function getPaste(int $version = 2, array $meta = array())
+    public static function getPaste($version = 2, array $meta = array())
     {
         $example = self::getPasteWithAttachment($version, $meta);
         // v1 has the attachment stored in a separate property
@@ -137,7 +138,7 @@ class Helper
      * @param  array $meta
      * @return array
      */
-    public static function getPasteWithAttachment(int $version = 2, array $meta = array())
+    public static function getPasteWithAttachment($version = 2, array $meta = array())
     {
         $example                 = $version === 1 ? self::$pasteV1 : self::$pasteV2;
         $example['meta']['salt'] = ServerSalt::generate();
@@ -152,7 +153,7 @@ class Helper
      * @param  array $meta
      * @return array
      */
-    public static function getPastePost(int $version = 2, array $meta = array())
+    public static function getPastePost($version = 2, array $meta = array())
     {
         $example = self::getPaste($version, $meta);
         $example['meta'] = array('expire' => $example['meta']['expire']);
@@ -165,7 +166,7 @@ class Helper
      * @param  array $meta
      * @return array
      */
-    public static function getPastePostJson(int $version = 2, array $meta = array())
+    public static function getPastePostJson($version = 2, array $meta = array())
     {
         $example = self::getPastePost($version, $meta);
         $example['adata'] = json_encode($example['adata']);
@@ -190,7 +191,7 @@ class Helper
      * @param  array $meta
      * @return array
      */
-    public static function getComment(int $version = 2, array $meta = array())
+    public static function getComment($version = 2, array $meta = array())
     {
         $example         = $version === 1 ? self::$commentV1 : self::$pasteV2;
         if ($version === 2) {