Improve documentation and examples

Author: yadaiio

README.md

@@ -10,7 +10,7 @@ built on top of [ReactPHP](https://reactphp.org/).
 Let's say you crawl a page and find that you need to send 100 HTTP requests to
 following pages which each takes `0.2s`. You can either send them all
 sequentially (taking around `20s`) or you can use
-[ReactPHP](https://reactphp.org) to concurrently request all your pages at the
+[ReactPHP](https://reactphp.org/) to concurrently request all your pages at the
 same time. This works perfectly fine for a small number of operations, but
 sending an excessive number of requests can either take up all resources on your
 side or may get you banned by the remote side as it sees an unreasonable number
@@ -84,12 +84,14 @@ $q = new Clue\React\Mq\Queue(3, null, function ($url) use ($browser) {
 foreach ($urls as $url) {
     $q($url)->then(function (Psr\Http\Message\ResponseInterface $response) use ($url) {
         echo $url . ': ' . $response->getBody()->getSize() . ' bytes' . PHP_EOL;
-    });
+    }, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+    }   );
 }
 
 ```
 
-See also the [examples](examples).
+See also the [examples](examples/).
 
 ## Usage
 
@@ -196,6 +198,10 @@ interface that makes it easy to react to when an operation is completed (i.e.
 either successfully fulfilled or rejected with an error):
 
 ```php
+<?php
+
+require __DIR__ . '/vendor/autoload.php';
+
 $promise->then(
     function ($result) {
         var_dump('Result received', $result);
@@ -284,6 +290,10 @@ schedule all jobs while limiting concurrency to ensure no more than
 resolves with the results of all jobs on success.
 
 ```php
+<?php
+
+require __DIR__ . '/vendor/autoload.php';
+
 $browser = new React\Http\Browser();
 
 $promise = Queue::all(3, $urls, function ($url) use ($browser) {
@@ -292,6 +302,8 @@ $promise = Queue::all(3, $urls, function ($url) use ($browser) {
 
 $promise->then(function (array $responses) {
     echo 'All ' . count($responses) . ' successful!' . PHP_EOL;
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
 });
 ```
 
@@ -360,6 +372,10 @@ resolves with the result of the first job on success and will then try
 to `cancel()` all outstanding jobs.
 
 ```php
+<?php
+
+require __DIR__ . '/vendor/autoload.php';
+
 $browser = new React\Http\Browser();
 
 $promise = Queue::any(3, $urls, function ($url) use ($browser) {
@@ -368,6 +384,8 @@ $promise = Queue::any(3, $urls, function ($url) use ($browser) {
 
 $promise->then(function (ResponseInterface $response) {
     echo 'First response: ' . $response->getBody() . PHP_EOL;
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
 });
 ```
 
@@ -449,6 +467,10 @@ Similarly, you can also wrap this in a function to provide a simple API and hide
 all the async details from the outside:
 
 ```php
+<?php
+
+require __DIR__ . '/vendor/autoload.php';
+
 use function React\Async\await; 
 
 /**

examples/01-http.php

@@ -30,4 +30,3 @@ function (Exception $e) use ($url) {
         }
     );
 }
-

examples/02-http-all.php

@@ -32,4 +32,3 @@ function ($e) {
         echo 'An error occurred: ' . $e->getMessage() . PHP_EOL;
     }
 );
-

examples/03-http-any.php

@@ -22,8 +22,9 @@
         function (Psr\Http\Message\ResponseInterface $response) use ($url) {
             // return only the URL for the first successful response
             return $url;
-        }
-    );
+        }, function (Exception $e) {
+            echo 'Error: ' . $e->getMessage() . PHP_EOL;
+           });
 });
 
 $promise->then(
@@ -34,4 +35,3 @@ function ($e) {
         echo 'An error occurred: ' . $e->getMessage() . PHP_EOL;
     }
 );
-