Implements wrapper method for a more secure unserialize with PHP 7 (#13285)

* Implements wrapper method for a more secure unserialize

* run AllTests on PHP 7

* trigger a debug message if unserialize fails on PHP 7 + tests

* Add string to deserialize to debug log.

1 files changed, 2 insertions, 1 deletions

diff --git a/core/Concurrency/DistributedList.php b/core/Concurrency/DistributedList.php
index 572b25d6ff..a01f27c1d8 100644
--- a/core/Concurrency/DistributedList.php
+++ b/core/Concurrency/DistributedList.php
@@ -7,6 +7,7 @@
  */
 namespace Piwik\Concurrency;
 
+use Piwik\Common;
 use Piwik\Container\StaticContainer;
 use Piwik\Option;
 use Psr\Log\LoggerInterface;
@@ -160,7 +161,7 @@ class DistributedList
 
         $result = array();
         if ($array
-            && ($array = unserialize($array))
+            && ($array = Common::safe_unserialize($array))
             && count($array)
         ) {
             $result = $array;