diff --git a/src/SplitIO/Component/Cache/SplitCache.php b/src/SplitIO/Component/Cache/SplitCache.php
index dadbc767..522a53a1 100644
--- a/src/SplitIO/Component/Cache/SplitCache.php
+++ b/src/SplitIO/Component/Cache/SplitCache.php
@@ -59,7 +59,9 @@ public function getSplit($splitName)
     public function getSplits($splitNames)
     {
         $cache = Di::getCache();
-        $cacheItems = $cache->fetchMany(array_map('self::getCacheKeyForSplit', $splitNames));
+        $cacheItems = $cache->fetchMany(array_map([
+            self::class, 'getCacheKeyForSplit'
+        ], $splitNames));
         $toReturn = array();
         foreach ($cacheItems as $key => $value) {
             $toReturn[self::getSplitNameFromCacheKey($key)] = $value;
@@ -74,7 +76,7 @@ public function getSplitNames()
     {
         $cache = Di::getCache();
         $splitKeys = $cache->getKeys(self::getCacheKeySearchPattern());
-        return array_map('self::getSplitNameFromCacheKey', $splitKeys);
+        return array_map([self::class, 'getSplitNameFromCacheKey'], $splitKeys);
     }
 
     /**
diff --git a/src/SplitIO/Grammar/Condition/Matcher/ContainsString.php b/src/SplitIO/Grammar/Condition/Matcher/ContainsString.php
index 581856d9..1d08a8b0 100644
--- a/src/SplitIO/Grammar/Condition/Matcher/ContainsString.php
+++ b/src/SplitIO/Grammar/Condition/Matcher/ContainsString.php
@@ -6,7 +6,7 @@
 
 class ContainsString extends AbstractMatcher
 {
-    protected $ContainsStringMatcherData = null;
+    private $containsStringMatcherData = null;
 
     public function __construct($data, $negate = false, $attribute = null)
     {
diff --git a/src/SplitIO/Sdk/Client.php b/src/SplitIO/Sdk/Client.php
index 1867fb90..bcc9463e 100644
--- a/src/SplitIO/Sdk/Client.php
+++ b/src/SplitIO/Sdk/Client.php
@@ -50,7 +50,7 @@ public function __construct($options = array())
      * @param $featureFlag
      * @param $treatment
      * @param string $label
-     * @param null $time
+     * @param $time
      * @param int $changeNumber
      * @param string $bucketingKey
      *
diff --git a/src/SplitIO/Sdk/Events/EventDTO.php b/src/SplitIO/Sdk/Events/EventDTO.php
index dcaaf7c3..d78da5ad 100644
--- a/src/SplitIO/Sdk/Events/EventDTO.php
+++ b/src/SplitIO/Sdk/Events/EventDTO.php
@@ -10,6 +10,7 @@ class EventDTO
     private $eventTypeId;
     private $value;
     private $timestamp;
+    private $properties;
 
     public function __construct($key, $trafficTypeName, $eventTypeId, $value, $properties)
     {
diff --git a/src/SplitIO/Sdk/Manager/SplitManager.php b/src/SplitIO/Sdk/Manager/SplitManager.php
index 2acefb2d..4a755eaf 100644
--- a/src/SplitIO/Sdk/Manager/SplitManager.php
+++ b/src/SplitIO/Sdk/Manager/SplitManager.php
@@ -22,7 +22,7 @@ public function splits()
     {
         $cache = new SplitCache();
         $rawSplits = $cache->getAllSplits();
-        return array_map('self::parseSplitView', $rawSplits);
+        return array_map([self::class, 'parseSplitView'], $rawSplits);
     }
 
     /**