Fix session_write_close on php7 (#15968)

* Fix session_write_close(): Session callback expects true/false return value

laravel/framework#15717

* Fix Styling

* Fixed same error with `session_destroy`

CookieSessionHandler.php

@@ -84,6 +84,8 @@ public function write($sessionId, $data)
             'data' => $data,
             'expires' => Carbon::now()->addMinutes($this->minutes)->getTimestamp(),
         ]), $this->minutes);
+
+        return true;
     }
 
     /**
@@ -92,6 +94,8 @@ public function write($sessionId, $data)
     public function destroy($sessionId)
     {
         $this->cookie->queue($this->cookie->forget($sessionId));
+
+        return true;
     }
 
     /**

DatabaseSessionHandler.php

@@ -120,6 +120,8 @@ public function write($sessionId, $data)
         }
 
         $this->exists = true;
+
+        return true;
     }
 
     /**
@@ -157,6 +159,8 @@ protected function getDefaultPayload($data)
     public function destroy($sessionId)
     {
         $this->getQuery()->where('id', $sessionId)->delete();
+
+        return true;
     }
 
     /**

FileSessionHandler.php

@@ -81,6 +81,8 @@ public function read($sessionId)
     public function write($sessionId, $data)
     {
         $this->files->put($this->path.'/'.$sessionId, $data, true);
+
+        return true;
     }
 
     /**
@@ -89,6 +91,8 @@ public function write($sessionId, $data)
     public function destroy($sessionId)
     {
         $this->files->delete($this->path.'/'.$sessionId);
+
+        return true;
     }
 
     /**