Added class and function stubs

stubs/Timecop.php

@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * Time travel to specified timestamp and freeze
+ *
+ * @param DateTimeInterface|int $time
+ *
+ * @return bool
+ */
+function timecop_freeze($time) {}
+
+/**
+ * Time travel to specified timestamp
+ *
+ * @param DateTimeInterface|int $time
+ *
+ * @return bool
+ */
+function timecop_travel($time) {}
+
+/**
+ * @param float $scale
+ */
+function timecop_scale($scale) {}
+
+/**
+ * Return from time travel to current time
+ */
+function timecop_return() {}
+
+class Timecop
+{
+    /**
+     * Time travel to specified timestamp and freeze
+     *
+     * @param DateTimeInterface|int $time
+     *
+     * @return bool
+     */
+    public static function freeze($time) {}
+
+    /**
+     * Time travel to specified timestamp
+     *
+     * @param DateTimeInterface|int $time
+     *
+     * @return bool
+     */
+    public static function travel($time) {}
+
+    /**
+     * @param float $scale
+     */
+    public static function scale($scale) {}
+
+    /**
+     * Return from time travel to current time
+     */
+    public static function return() {}
+}
+
+class TimecopDateTime extends DateTime {}
+
+class TimecopOrigDateTime extends DateTime {}
+
+class TimecopDateTimeImmutable extends DateTimeImmutable {}
+
+class TimecopOrigDateTimeImmutable extends DateTimeImmutable {}