Added basic next-tick/future-tick example.

Author: jmalloc

examples/next-tick.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+This example shows how nextTick and futureTick events are scheduled for
+execution.
+
+The expected output is:
+
+    next-tick #1
+    next-tick #2
+    future-tick #1
+    timer
+    future-tick #2
+
+Note that both nextTick and futureTick events are executed before timer and I/O
+events on each tick.
+
+nextTick events registered inside an existing nextTick handler are guaranteed
+to be executed before timer and I/O handlers are processed, whereas futureTick
+handlers are always deferred.
+*/
+
+require __DIR__.'/../vendor/autoload.php';
+
+$loop = React\EventLoop\Factory::create();
+
+$loop->addTimer(
+    0,
+    function () {
+        echo 'timer' . PHP_EOL;
+    }
+);
+
+$loop->nextTick(
+    function ($loop) {
+        echo 'next-tick #1' . PHP_EOL;
+
+        $loop->nextTick(
+            function () {
+                echo 'next-tick #2' . PHP_EOL;
+            }
+        );
+    }
+);
+
+$loop->futureTick(
+    function ($loop) {
+        echo 'future-tick #1' . PHP_EOL;
+
+        $loop->futureTick(
+            function () {
+                echo 'future-tick #2' . PHP_EOL;
+            }
+        );
+    }
+);
+
+$loop->run();