Fix internal API usage (#306)

Author: smoothie

packages/php/src/Metrics.php

@@ -228,7 +228,7 @@ public function constructPayload(string $log_id, Request $request, $response): a
                         [
                             'pageref' => $request->url(),
                             'startedDateTime' => date('c', $request_start),
-                            'time' => (microtime(true) - $request_start) * 1000,
+                            'time' => (int) ((microtime(true) - $request_start) * 1000),
                             'request' => $this->processRequest($request),
                             'response' => $this->processResponse($response)
                         ]

packages/php/tests/MetricsTest.php

@@ -307,7 +307,7 @@ public function testConstructPayload(): void
             'startedDateTime was not in a format matching `2019-12-19T01:17:51+00:00`.'
         );
 
-        $this->assertIsFloat($payload_entry['time']);
+        $this->assertIsInt($payload_entry['time']);
         $this->assertIsNumeric($payload_entry['time']);
         $this->assertGreaterThan(0, $payload_entry['time']);