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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Voodoo PHP</title>
<meta name="description" content="Obscure and unknown PHP practices">
<meta name="author" content="Marco Pivetta">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
<link rel="stylesheet" href="css/theme.css" id="theme">
<link rel="stylesheet" href="bower_components/reveal.js/lib/css/zenburn.css">
<!-- Printing and PDF exports -->
<script>
var link = document.createElement('link');
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = window.location.search.match(/print-pdf/gi) ? 'bower_components/reveal.js/css/print/pdf.css'
: 'bower_components/reveal.js/css/print/paper.css';
document.getElementsByTagName('head')[0].appendChild(link);
</script>
</head>
<body>
<div class="reveal">
<div class="slides">
<section><h1>Hi!</h1></section>
<section><h1>I'm <span class="doctrine-color">Marco</span>!</h1>
</section>
<section><h1><a href="https://twitter.com/Ocramius" target="_blank">Ocramius</a></h1>
</section>
<section><img src="assets/img/ocramius.gif" width="40%" class="crisp-image"/></section>
<section><blockquote class="twitter-tweet" lang="en">
<p lang="en" dir="ltr">
<a href="https://twitter.com/Ocramius">@Ocramius</a>
<a href="https://twitter.com/asgrim">@asgrim</a>
<a href="https://twitter.com/RoaveTeam">@RoaveTeam</a>
Imma start calling you Gandalphp.
</p>
— Lee Davis (@leedavis81)
<a href="https://twitter.com/leedavis81/status/619104849490264064">9 July 2015</a>
</blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
</section>
<section><img src="assets/img/gandalphp.png" width="40%" class="crisp-image"/>
</section>
<section><img src="assets/img/roave.svg"/>
</section>
<section><img src="assets/img/zf-logo.svg"/>
</section>
<section><img src="assets/img/doctrine.svg"/>
</section>
<section><h2>What is <span class="doctrine-color">Voodoo</span>?</h2>
<blockquote class="fragment">/ˈvuːduː/</blockquote>
<blockquote class="fragment">Vodou</blockquote>
<p class="fragment">
An
<span class="doctrine-color">African</span>
/
<span class="php-color">Caribbean</span>
/
<span class="zf-color">South US</span>
religion
</p>
</section>
<section><p>
<span class="doctrine-color">Vodou</span>
means
<span class="php-color">Spirit</span>
in
<span class="zf-color">west-african</span>
cultures
</p>
<p class="fragment">
There are different variations of
<span class="doctrine-color">Vodou</span>
</p>
<p class="fragment">
<span class="doctrine-color">Vodun</span>
is a
<span class="php-color">fatalist</span>
creed
</p>
<p class="fragment">
Events are pre-defined, in a chain of
<span class="doctrine-color">cause</span>
and
<span class="zf-color">effect</span>
</p>
<p class="fragment">
One must ask the <span class="php-color">lwa</span> (spirits).
</p>
<p class="fragment">
One does not act on his or her own.
</p>
</section>
<section><h2>
I will skip on
<span class="doctrine-color">Vodou</span>
<span class="php-color">rituals</span>
</h2>
<p class="fragment">
I just got you interested in the talk
</p>
<p class="fragment">
I don't want to talk about a religion that <strong>I do not know</strong>
</p>
</section>
<section><h2>What <span class="doctrine-color">Vodou</span> are we talking about?</h2>
<p class="fragment">
<span class="php-color">PHP</span>
<span class="zf-color">Magic</span>!
</p>
<p class="fragment">
In <span class="php-color">Programming</span>,
<span class="doctrine-color">Magic</span>
is used to describe code that handles complex tasks,
hiding that complexity to present a simple interface.
</p>
<p class="fragment" style="font-size: 30%;">
Thanks,
<a href="http://en.wikipedia.org/wiki/Magic_%28programming%29" target="_blank">Wikipedia!</a>
</p>
</section>
<section><h2>Who does <span class="doctrine-color">Vodou PHP</span>?</h2>
<p class="fragment">
Many <span class="php-color">Junior developers</span> trying to over-abstract
</p>
<p class="fragment">
Very few <span class="zf-color">Senior developers</span>, when building compromises
</p>
</section>
<section><h2>
<span class="doctrine-color">Programming Magic</span>
<br/>
can be
<br/>
<span class="php-color">Very Dangerous</span>
</h2></section>
<section><h2>
Practice
<br/>
<span class="zf-color">Extreme Caution</span>
</h2></section>
<section data-background="assets/img/warning.jpeg" ></section>
<section><h2>
What
<br/>
<span class="doctrine-color">Tools</span>
<br/>
do we need for
<br/>
<span class="php-color">Magic</span>?
</h2>
<p class="fragment">
(just a refresh)
</p></section>
<section><h2><span class="php-color">Magic</span> <span class="zf-color">Methods</span></h2>
<p class="fragment">
<code>__construct</code>
<code>__destruct</code>
<code>__get</code>
<code>__set</code>
<code>__isset</code>
<code>__unset</code>
<code>__sleep</code>
<code>__wakeup</code>
<code>__clone</code>
<code>__invoke</code>
<code>__call</code>
<code>__callStatic</code>
<code>__set_state</code>
<code>__debugInfo</code>
</p></section>
<section><h2><span class="php-color">Reflection</span></h2>
<p class="fragment"><code>ReflectionClass</code></p>
<p class="fragment"><code>ReflectionProperty</code></p>
<p class="fragment"><code>ReflectionMethod</code></p>
<p class="fragment"><code>ReflectionFunction</code></p>
</section>
<section><h2><span class="php-color">Closures</span>!</h2>
<p class="fragment"><code>$f = function () {};</code></p>
<p class="fragment"><code>$f = (function () {})->bindTo($that, 'Foo');</code></p>
<p class="fragment" style="font-size: 40%;">
(No, this syntax won't work, sadly)
</p>
</section>
<section><h2>
Some <span class="php-color">constructs</span>
<br/>
and <span class="php-color">functions</span>
</h2>
<p class="fragment"><code>func_get_args()</code></p>
<p class="fragment"><code>debug_backtrace()</code></p>
<p class="fragment"><code>isset</code></p>
<p class="fragment"><code>unset</code></p>
<p class="fragment"><code>(array)</code> cast</p>
</section>
<section><h2>Let's create a <span class="doctrine-color">puppet</span>!</h2>
<p class="fragment">Generally referred to as <span class="zf-color">friend object</span></p>
</section>
<section><p>Our <span class="doctrine-color">puppet</span>:</p>
<pre><code data-trim>
class User
{
private $name;
private $surname;
public function __construct($name, $surname)
{
$this->name = $name;
$this->surname = $surname;
}
public function sayHello()
{
return 'Hello, I\'m ' . $this->name . ' '
. $this->surname . '!' . PHP_EOL;
}
}
</code></pre>
</section>
<section><p>Simplistic <span class="doctrine-color">puppeteer</span>:</p>
<pre><code data-trim>
class Puppeteer {
public $properties = [];
public function __construct($puppet)
{
foreach (
(new ReflectionClass($puppet))->getProperties()
as $property
) {
Closure::bind(function (& $properties) use ($property) {
$name = $property->getName();
$properties[$name] = & $this->$name;
}, $puppet, $property->getDeclaringClass()->getName())
->__invoke($this->properties);
}
}
}
</code></pre>
</section>
<section><pre><code data-trim>
$user = new User('James', 'Titcumb');
var_dump($user->sayHello());
$puppeteer = new Puppeteer($user);
$puppeteer->properties['name'] = 'A';
$puppeteer->properties['surname'] = 'Minion';
var_dump($user->sayHello());
</code></pre>
</section>
<section><h2><span class="doctrine-color">leedavis81/altr-ego</span></h2>
<p class="fragment">A decent puppeteer example</p></section>
<section><pre><code data-trim>
class Foo
{
private $bar = '0';
private saySomething($baz)
{
return $this->bar . $baz;
}
}
</code></pre>
<pre class="fragment"><code data-trim>
$altrEgo = AltrEgo::create(new Foo());
$altrEgo->bar = '11';
var_dump($altrEgo->saySomething('22'));
</code></pre>
</section>
<section><h2><span class="doctrine-color">Hiding Properties</span></h2>
</section>
<section><pre><code data-trim>
class Thing
{
public $something = 'foo';
public function saySomething()
{
return $this->something;
}
}
</code></pre>
<pre class="fragment"><code data-trim>
$thing = new Thing();
var_dump($thing->saySomething());
unset($thing->something);
var_dump($thing->saySomething()); // ???
</code></pre></section>
<section><h2>What can we do with that?</h2></section>
<section><pre><code data-trim>
class MagicThing
{
public $something = 'foo';
public function saySomething()
{
return $this->something;
}
public function __get($name)
{
throw new DomainException('Stop touching my things!');
}
}
</code></pre>
<pre class="fragment"><code data-trim>
$thing = new Thing();
var_dump($thing->saySomething());
unset($thing->something);
var_dump($thing->saySomething()); // ???
</code></pre></section>
<section><h1>
<abbr title="Aspect Oriented Programming" class="doctrine-color">AOP</abbr>
</h1>
<p class="fragment">
A
<span class="zf-color">programming paradigm</span>
to separate
<span class="php-color">cross-cutting concerns</span>
</p>
</section>
<section><p>
Usually considered <span class="php-color">magic</span>
</p>
<p class="fragment">
Not very different from <span class="zf-color">macros</span>
</p>
<p class="fragment">
In <span class="php-color">PHP</span>, usually rewrites files when they are included
</p></section>
<section><h2>lisachenko/<span class="doctrine-color">go-aop-php</span></h2>
<p class="fragment">
<abbr title="Aspect Oriented Programming" class="doctrine-color">AOP</abbr>
framework for PHP
</p>
<p class="fragment">
<strong>No extensions</strong> required
</p>
</section>
<section><pre><code data-trim>
class CatchAll implements \Go\Aop\Aspect
{
/** @Go\Lang\Annotation\Before("execution(*->*(*))") */
public function beforeAnything(
\Go\Aop\Intercept\MethodInvocation $invocation
) {
var_dump($invocation->getMethod()->getName());
return $invocation->proceed();
}
}
</code></pre>
<pre><code data-trim>
$foo->bar();
$bar->baz();
</code></pre>
</section>
<section><h2><span class="doctrine-color">__debugInfo</span> to make things more confusing</h2></section>
<section><pre><code data-trim>
class Foo
{
private $thisWillGoWrongSomewhere = 'OHAI!';
public function __debugInfo() {
// let me confuse you a bit
return [];
}
}
</code></pre>
<pre class="fragment"><code data-trim>
var_dump(new Foo());
</code></pre>
</section>
<section data-background="assets/img/whyyy.png" ></section>
<section data-background="assets/img/but-wait-there-s-more.jpg" ></section>
<section><pre><code data-trim>
var_dump((object) ["\0Foo\0bar" => 'baz']);
</code></pre>
</section>
<section><pre><code data-trim>
$foo = (object) ["\0Foo\0bar" => 'baz'];
var_dump($foo->{"\0Foo\0bar"});
</code></pre>
</section>
<section data-background="assets/img/neutral-suspicious.png" ></section>
<section><pre><code data-trim>
$foo = (object) ["\0Foo\0bar" => 'baz'];
var_dump($foo->bar);
</code></pre>
</section>
<section data-background="assets/img/wtf.jpeg" ></section>
<section><pre><code data-trim>
$foo = (object) ["\0Foo\0bar" => 'baz'];
$rp = new ReflectionProperty('stdClass', 'bar');
$rp->setAccessible(true);
var_dump($rp->getValue($foo));
</code></pre>
</section>
<section><pre><code data-trim>
$foo = (object) ["\0Foo\0bar" => 'baz'];
var_dump(Closure::bind(function () {
return $this->baz;
}, $foo, 'Foo')->__invoke());
</code></pre>
</section>
<section data-background="assets/img/trollface.jpg" ><h1><strong>
The perfect
<br/>
<span class="doctrine-color">Immutable Object</span>?
</strong></h1></section>
<section><h1><span class="doctrine-color">Voodoo</span> <span class="php-color">Libraries</span></h1></section>
<section><h2><span class="doctrine-color">doctrine/instantiator</span></h2>
<p class="fragment">
Instantiate <span class="php-color">classes</span> without calling their <span class="zf-color">constructor</span>.
</p>
</section>
<section><pre><code data-trim>
class NotInstantiableSingleton
{
public static function getInstance() { /* horror */ }
private function __construct() {}
}
</code></pre>
<pre class="fragment"><code data-trim>
$instance = new NotInstantiableSingleton(); // crash
</code></pre>
<pre class="fragment"><code data-trim>
$instance = (new \Doctrine\Instantiator\Instantiator())
->instantiate('NotInstantiableSingleton');
</code></pre>
</section>
<section><h2><span class="doctrine-color">leedavis81/vent</span></h2>
<p class="fragment">Object internal initialization event system</p></section>
<section><pre><code data-trim>
class Foo {
use Vent\VentTrait;
private $bar;
public function __construct() {
$this->registerEvent('read', 'bar', function() {
echo 'Reading "bar"' . PHP_EOL;
});
}
public function doSomething() {
return $this->bar;
}
}
</code></pre>
<pre class="fragment"><code data-trim>
$foo = new Foo();
$foo->doSomething();
</code></pre>
</section>
<section><h2><span class="doctrine-color">ocramius/lazy-map</span></h2>
<p class="fragment">Super fast lazy-initialized registry</p></section>
<section><pre><code data-trim>
$map = new \LazyMap\CallbackLazyMap(function ($name) {
return new \ReflectionClass($name);
});
</code></pre>
<pre class="fragment"><code data-trim>
var_dump($map->ArrayObject);
var_dump($map->ArrayIterator);
</code></pre>
</section>
<section><h2><span class="doctrine-color">TimeToogo/Pinq</span></h2>
<p class="fragment">
Inspects
<span class="php-color">Closures</span>
to build custom
<span class="zf-color">expressions</span>
in various
<span class="zf-color">DSLs</span>
</p>
</section>
<section><pre><code data-trim>
$db
->table('customers')
->where(function ($row) { return $row['age'] <= 50; })
->orderByAscending(function ($row) { return $row['firstName']; })
->select(function ($row) {
return [
'fullName' => $row['firstName'] . ' ' . $row['lastName']
];
})
->asArray()
</code></pre>
<pre><code data-trim>
SELECT
CONCAT(CONCAT(customers.firstName, ' '), customers.lastName)
AS fullName
FROM (
SELECT * FROM (
SELECT * FROM (SELECT * FROM customers) AS customers
WHERE (customers.age <= 50)
) AS customers
ORDER BY customers.firstName ASC
LIMIT 50 OFFSET 0
) AS customers
</code></pre>
</section>
<section><h2><span class="doctrine-color">jeremeamia/super_closure</span></h2>
<p class="fragment">Save/load code</p>
<p class="fragment">Save/load your bugs! <span class="fragment">(you're welcome!)</span></p></section>
<section><pre><code data-trim>
$serializer = new SuperClosure\Serializer();
$serialized = $serializer->serialize(function () {
echo file_get_contents(__FILE__);
});
$serializer->unserialize($serialized)->__invoke();
</code></pre>
</section>
<section><h2><span class="doctrine-color">ocramius/proxy-manager</span></h2>
<p class="fragment">All sorts of crazy hacks around <span class="php-color">object state</span></p>
<p class="fragment">
<span class="doctrine-color">Lazy objects</span>,
<span class="zf-color">AOP</span>,
<span class="php-color">Decorators</span>
</p>
</section>
<section><pre><code data-trim>
class Foo {
public function __construct()
{
sleep(5);
}
public function doFoo()
{
echo "Foo!";
}
}
</code></pre>
<pre class="fragment"><code data-trim>
$factory = new LazyLoadingValueHolderFactory();
$proxy = $factory->createProxy(
'Foo',
function (& $wrapped, $p, $m, $args, & $initializer) {
$initializer = null;
$wrapped = new Foo();
}
);
var_dump($proxy);
</code></pre>
</section>
<section><pre><code data-trim>
class Foo {
public function doFoo()
{
echo "Foo!";
}
}
</code></pre>
<pre class="fragment"><code data-trim>
$factory = new AccessInterceptorScopeLocalizerFactory();
$proxy = $factory->createProxy(
new Foo(),
['doFoo' => function ($proxy) { echo "pre\n"; }],
['doFoo' => function ($proxy) { echo "post\n"; }]
);
$proxy->doFoo();
</code></pre>
</section>
<section><pre><code data-trim>
class Foo {
private $bar = 'baz';
public function sayBar()
{
echo $this->bar;
}
}
</code></pre>
<pre class="fragment"><code data-trim>
$factory = new LazyLoadingGhostFactory();
$proxy = $factory->createProxy(
'Foo',
function ($p, $m, $args, & $initializer, array $properties) {
$initializer = null;
$properties["\0Foo\0bar"] = 'HAHA!';
}
);
$proxy->sayBar();
</code></pre>
</section>
<section><h2><span class="doctrine-color">roave/strict-php</span></h2>
<p class="fragment"><strong>DEV-MASTER only!!!</strong></p>
</section>
<section><h2>Turns <span class="php-color">PHP</span> into <span class="zf-color">JAVA</span></h2>
<p class="fragment">(not really)</p>
</section>