PHPC-1254: Implement test plan for ObjectID spec

Author: alcaeus

tests/bson/bson-objectid-getTimestamp-002.phpt

@@ -0,0 +1,29 @@
+--TEST--
+MongoDB\BSON\ObjectId::getTimestamp: Ensure that the Timestamp field is represented as an unsigned 32-bit integer
+--FILE--
+<?php
+date_default_timezone_set("UTC");
+
+function create_object_id($oid_string)
+{
+    $objectid = new MongoDB\BSON\ObjectId($oid_string);
+    $ts = sprintf("%u", $objectid->getTimestamp());
+    echo $ts, "\n";
+    echo date_create("@{$ts}")->format("Y-m-d H:i:s"), "\n";
+}
+
+create_object_id('000000000000000000000000');
+create_object_id('7FFFFFFF0000000000000000');
+create_object_id('800000000000000000000000');
+create_object_id('FFFFFFFF0000000000000000');
+
+?>
+--EXPECT--
+0
+1970-01-01 00:00:00
+2147483647
+2038-01-19 03:14:07
+2147483648
+2038-01-19 03:14:08
+4294967295
+2106-02-07 06:28:15