diff --git a/core/Callbacks/CallQueueListening.php b/core/Callbacks/CallQueueListening.php
index 41371a5d..70e53c51 100755
--- a/core/Callbacks/CallQueueListening.php
+++ b/core/Callbacks/CallQueueListening.php
@@ -38,7 +38,7 @@ class CallQueueListening extends Listening implements UsageInformationAble {
 	public function triggerCallback() {
 		$params = func_get_args();
 		if ($this->triggerCallbackWithParams($params, false) === false) {
-			if ($this->$errorMethod != null) {
+			if ($this->errorMethod != null) {
 				call_user_func($this->errorMethod, $this->method);
 			}
 
@@ -54,7 +54,7 @@ class CallQueueListening extends Listening implements UsageInformationAble {
 	 * @param array $params
 	 * @return mixed
 	 */
-	public function triggerCallbackWithParams(array $params, bool $callErrorMethod = true) {
+	public function triggerCallbackWithParams(array $params, $callErrorMethod = true) {
 		$result = call_user_func_array($this->getUserFunction(), $params);
 		if ($callErrorMethod && $result === false) {
 			if ($this->errorMethod != null) {
diff --git a/core/Callbacks/CallQueueManager.php b/core/Callbacks/CallQueueManager.php
index 14f13a7c..8950f168 100755
--- a/core/Callbacks/CallQueueManager.php
+++ b/core/Callbacks/CallQueueManager.php
@@ -41,7 +41,7 @@ class CallQueueManager implements UsageInformationAble {
 	 * @param mixed             $errorMethod
 	 * @return bool
 	 */
-	public function registerListening(CallQueueListener $listener, $methods, $errorMethod = null, bool $important = false) {
+	public function registerListening(CallQueueListener $listener, $methods, $errorMethod = null, $important = false) {
 		if ($errorMethod != null && !CallQueueListening::checkValidCallback($listener, $errorMethod)) {
 			trigger_error("Given Listener (" . get_class($listener) . ") can't handle Queue Call Callback (No Error Method '{$errorMethod}')!");
 			return false;
@@ -96,7 +96,7 @@ class CallQueueManager implements UsageInformationAble {
 	 * @param string            $method
 	 * @return bool
 	 */
-	public function hasListening(CallQueueListener $listener, string $method) {
+	public function hasListening(CallQueueListener $listener, $method) {
 		foreach ($this->queueListenings as $listening) {
 			if ($listening->listener === $listener && $listening->method === $method) {
 				return true;
diff --git a/core/Commands/CommandManager.php b/core/Commands/CommandManager.php
index 72389ad2..2fc1219e 100644
--- a/core/Commands/CommandManager.php
+++ b/core/Commands/CommandManager.php
@@ -127,7 +127,7 @@ class CommandManager implements CallbackListener, UsageInformationAble {
 	 * @param bool            $adminCommand
 	 * @param CommandListener $listener
 	 */
-	public function disableCommand($commandName, bool $adminCommand, CommandListener $listener) {
+	public function disableCommand($commandName, $adminCommand, CommandListener $listener) {
 		if (is_array($commandName)) {
 			foreach ($commandName as $command) {
 				$this->disableCommand($command, $adminCommand, $listener);
@@ -163,7 +163,7 @@ class CommandManager implements CallbackListener, UsageInformationAble {
 	 * @param bool            $adminCommand
 	 * @param CommandListener $listener
 	 */
-	public function enableCommand($commandName, bool $adminCommand, CommandListener $listener) {
+	public function enableCommand($commandName, $adminCommand, CommandListener $listener) {
 		if (is_array($commandName)) {
 			foreach ($commandName as $command) {
 				$this->enableCommand($command, $adminCommand, $listener);
@@ -198,7 +198,7 @@ class CommandManager implements CallbackListener, UsageInformationAble {
 	 * @param bool  $adminCommand
 	 * @return bool|array
 	 */
-	public function isCommandEnabled($commandName, bool $adminCommand) {
+	public function isCommandEnabled($commandName, $adminCommand) {
 		if (is_array($commandName)) {
 			$results = array();
 			foreach ($commandName as $command) {
diff --git a/core/Files/FileUtil.php b/core/Files/FileUtil.php
index b4791873..9b7b9377 100644
--- a/core/Files/FileUtil.php
+++ b/core/Files/FileUtil.php
@@ -244,7 +244,7 @@ abstract class FileUtil {
 	 * @param string $path
 	 * @return string
 	 */
-	public static function shortenPath(string $path) {
+	public static function shortenPath($path) {
 		$root = substr($path, 0, 1) === '/';
 		$path = str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $path);
 		$parts = array_filter(explode(DIRECTORY_SEPARATOR, $path), 'strlen');
diff --git a/core/Utils/DataUtil.php b/core/Utils/DataUtil.php
index 16803441..0a3d2d70 100644
--- a/core/Utils/DataUtil.php
+++ b/core/Utils/DataUtil.php
@@ -20,7 +20,7 @@ abstract class DataUtil {
 	 * @param  string $root
 	 * @return string
 	 */
-	public static function buildXmlStandaloneFromArray(array $a, string $root = '') {
+	public static function buildXmlStandaloneFromArray(array $a, $root = '') {
 		$domDocument                = new \DOMDocument("1.0", "utf-8");
 		$domDocument->xmlStandalone = true;
 
@@ -70,7 +70,7 @@ abstract class DataUtil {
 	 * @param bool  $recurse
 	 * @return array
 	 */
-	public static function implodePositions(array $a, bool $recurse = true) {
+	public static function implodePositions(array $a, $recurse = true) {
 		$result = array();
 		foreach ($a as $key => $value) {
 			if (is_array($value)) {
@@ -95,7 +95,7 @@ abstract class DataUtil {
 	 * @param string $prefix (used for recursion)
 	 * @return array
 	 */
-	public static function flattenArray(array $a, string $delimiter = '.', string $prefix = '') {
+	public static function flattenArray(array $a, $delimiter = '.', $prefix = '') {
 		$result = array();
 		foreach ($a as $key => $value)
 		{
@@ -121,7 +121,7 @@ abstract class DataUtil {
 	 * @param string $delimiter
 	 * @return array
 	 */
-	public static function unflattenArray(array $a, string $delimiter = '.') {
+	public static function unflattenArray(array $a, $delimiter = '.') {
 		$result = array();
 		foreach ($a as $key => $value) {
 			if (!is_string($key)) {