PHP ao Extremo

Quem sou eu???

• github.com/thiagophx
• @thiagophx
• thiagorigo.com
• phpml.org

Agenda

• pecl/operator
• pecl/runkit *
• SplTypes
• php5.3.99-dev

<?php

class CarrinhoCompras
{
protected $produtos;

public function __construct()
{
$this->produtos = array();
}

public function addProduto($produto)
{
$this->produtos[] = $produto;
}
}

$obj1 = new CarrinhoCompras();
$obj1->addProduto(new StdClass());


echo $obj1 + $obj2;

<?php

{

{
}

{
}
}



echo $obj1 + $obj2;

// Notice: Object of class CarrinhoCompras could not be converted to int...

<?php

{

{
}

{
}

public function count()
{
return count($this->produtos);
}
}



echo $obj1->count() + $obj2->count();

<?php

class CarrinhoCompras implements Countable
{

{
}

{
}

public function count()
{
return count($this->produtos);
}
}



echo count($obj1) + count($obj2);

Porque isso funciona?

<?php

$d1 = new DateTime();
$d2 = new DateTime('1991-10-21');

var_dump($d1 > $d2);

<?php

{

{
}

{
}
}



var_dump($obj1 > $obj2);

<?php

{

{
}

{
}

public function __add(CarrinhoCompras $carrinho = null)
{
return count($this->produtos) + ($carrinho ? $carrinho->__add() : 0);
}
}



echo $obj1 + $obj2;

<?php

interface Summable
{
public function __add(Summable $value = null);
}

class CarrinhoCompras implements Summable
{

{
}

{
}

public function __add(Summable $value = null)
{
return count($this->produtos) + ($value ? $value->__add() : 0);
}
}



echo $obj1 + $obj2;

<?php

{

{
}

{
}

{
}
}




var_dump($obj1 + $obj2 + $obj3);

// ???

<?php

{

{
}

{
}

{
}
}




var_dump($obj1 + $obj2 + $obj3);

// Notice: Object of class CarrinhoCompras could not be converted to int...

<?php

{

{
}

{
}

public function __add($value = null)
{
if (is_int($value))
return count($this->produtos) + $value;

return count($this->produtos) + ($value ? $value->__add() : 0);
}
}




var_dump($obj1 + ($obj2 + $obj3));

<?php

class ContaCorrente // Entity
{
public function depositar(Dinheiro $valor)
{
$this->setSaldo($this->getSaldo() + $valor);
}
}

class Dinheiro // ValueObject
{
const BRL = 1;
const AUD = 2;

protected $tipoMoeda;

public function getTipoMoeda() { ... }

public function converte($tipoMoeda)
{
return $this->getValor() * $tipoMoeda;
}

public function __add($dinheiro)
{
return $this->getValor() + $dinheiro->convert($this->getTipoMoeda());
}
}

$conta = new ContaCorrente(/* id */);
$valor = new Dinheiro(100);
$conta->depositar($valor);

Operadores disponíveis

+, -, *, /, %, <<, >>, ., |, &, ^, ~, !, ++, --, +=, -=, *=,
/=, %=, <<=, >>=, .=, |=, &=, ^=, ~=, ==, !=, ===, !==, <, <=

Nada é perfeito...

• Só funciona no 5.2

Injeção de Dependência
<?php

// Zend Framework: A setter injection example
$transport = new Zend_Mail_Transport_Smtp('smtp.gmail.com', array(
'auth' => 'login',
'username' => 'foo',
'password' => 'bar',
'ssl' => 'ssl',
'port' => 465,
));

$mailer = new Zend_Mail();
$mailer->setDefaultTransport($transport);

Container de Injeção de Dependência

Symfony
<?xml version="1.0" ?>

<container xmlns="http://symfony-project.org/2.0/container">
<parameters>
<parameter key="mailer.username">foo</parameter>
<parameter key="mailer.password">bar</parameter>
<parameter key="mailer.class">Zend_Mail</parameter>
</parameters>
<services>
<service id="mail.transport" class="Zend_Mail_Transport_Smtp" shared="false">
<argument>smtp.gmail.com</argument>
<argument type="collection">
<argument key="auth">login</argument>
<argument key="username">%mailer.username%</argument>
<argument key="password">%mailer.password%</argument>
<argument key="ssl">ssl</argument>
<argument key="port">465</argument>
</argument>
</service>
<service id="mailer" class="%mailer.class%">
<call method="setDefaultTransport">
<argument type="service" id="mail.transport" />
</call>
</service>
</services>
</container>

Symfony

<?php
require_once '/PATH/TO/sfServiceContainerAutoloader.php';
sfServiceContainerAutoloader::register();

$sc = new sfServiceContainerBuilder();

$loader = new sfServiceContainerLoaderFileXml($sc);
$loader->load('/somewhere/container.xml');
$sc->mailer;

Você não chama, você é chamado!

<?php

class UserService
{
protected $serviceLocator;

public function __construct($serviceLocator)
{
$this->serviceLocator = $serviceLocator;
}

public function saveUser(array $data)
{
$validator = $this->serviceLocator->getService('validator');

try {
// Valida os dados
$data = $validator->validate($data);

$repository = new UserRepository();
$user = new User();

// Persiste os dados
return $repository->save($data, $user);

} catch (Exception $e) {
$this->serviceLocator->getService('logger')->log($e);
}

return null;
}
}

<?php

class UserService
{
/**
* @Dependency(validator)
*/
protected $validator;

/**
* @Dependency(logger)
*/
protected $logger;

public function saveUser(array $data)
{
try {
// Valida os dados
$data = $this->validator->validate($data);

$repository = new UserRepository();
$user = new User();

// Persiste os dados
return $repository->save($data, $user);

} catch (Exception $e) {
$this->logger->log($e);
}

return null;
}
}

runkit
https://github.com/zenovich/runkit/

<?php

class Container
{
protected static $data = array('mailer' => 'mailer');

public static function get($key)
{
if (!self::exists($key))
throw new InvalidArgumentException('Invalid key!');

return self::$data[$key];
}

public static function exists($key)
{
return array_key_exists($key, self::$data);
}

public static function notify($object)
{
$injector = new Injector($object, self::$data);
return $injector->inject();
}
}

<?php

class Watcher
{
protected $dir;

public function __construct($dir)
{
$this->dir = $dir;
}

public function watch()
{
foreach (glob($this->dir . DIRECTORY_SEPARATOR . '*.php') as $class) {
require $class;
runkit_method_add(pathinfo($class, PATHINFO_FILENAME),
'__construct',
'',
'Container::notify($this);');
}
}
}

<?php

class Injector
{
protected $object;

public function __construct($object)
{
$this->object = $object;
}

public function inject()
{
$reflection = new ReflectionObject($this->object);
$prop = $reflection->getProperty('mailer');

if (!Container::exists('mailer'))
return null;

$prop->setAccessible(true);
$prop->setValue($this->object, Container::get('mailer'));
return true;
}
}

<?php

class Controller
{
protected $mailer;

public function get()
{
var_dump($this->mailer);
}
}

<?php

$w = new Watcher('path/to/my/folder');
$w->watch();

$c = new Controller();
$c->get();
// string(6) "mailer"

<?php

class AnnotationParser
{
protected $class;

public function __construct(ReflectionClass $class)
{
$this->class = $class;
}

public function parseDependencies()
{
$dependencies = array();

foreach ($this->class->getProperties() as $prop)
if ($this->matchDependency($prop, $matches))
$dependencies[] = array('property' => $prop, 'dependency' => $matches[1]);

return $dependencies;
}

protected function matchDependency($prop, &$matches)
{
return (bool) preg_match('/@dependencys*(([a-zA-Z0-9_ ]*))/i',
$prop->getDocComment(), $matches);
}
}

<?php

class Injector
{
protected $object;

public function __construct($object)
{
$this->object = $object;
}

public function inject()
{
$annotationParser = new AnnotationParser(new ReflectionObject($this->object));
$props = $annotationParser->parseDependencies();

foreach ($props as $prop) {
if (Container::exists($prop['dependency'])) {
$prop['property']->setAccessible(true);
$prop['property']->setValue($this->object,
Container::get($prop['dependency']));
}

}
}
}

<?php

class Container
{
protected static $data = array();

public static function set($key, $value)
{
self::$data[$key] = $value;
}

public static function get($key)
{
if (!self::exists($key))
throw new InvalidArgumentException('Invalid key!');

return self::$data[$key];
}

public static function exists($key)
{
return array_key_exists($key, self::$data);
}

public static function notify($object)
{
$injector = new Injector($object, self::$data);
return $injector->inject();
}
}

<?php

class Validator
{
public function validate()
{
// ...
}
}

class Logger
{
public function log()
{
// ...
}
}

$w = new Watcher('path/to/my/folder');
$w->watch();

Container::set('validator', new Validator());
Container::set('logger', new Logger());

$c = new UserService();
$c->saveUser(array());

Melhorias

• Veriﬁcar existência de __construct
• Pegar os parametros do __construct
• Observar classes dentro de
namespaces(recursivo)

Recursos

• function_add, *_remove, *_copy,
*_redeﬁne, *_rename
• method_add, *_remove, *_copy,
*_redeﬁne, *_rename

E agora???

• Tokenizer
• Mutagenesis (https://github.com/
padraic/mutagenesis)

<?php

$id = $_GET['id']; // int
$valor = $_GET['valor']; // float

<?php

$id = (int) $_GET['id']; // int
$valor = (float) $_GET['valor']; // float

<?php


function processa($id, $valor)
{
// ...
}

<?php


{
$id = (int) $id;
$valor = (float) $valor;

echo $id, $valor;
}

processa($id, $valor);

<?php


{
if (!is_int($id))
throw new InvalidArgumentException('Tipo inválido');

if (!is_float($valor))

echo $id, $valor;
}


<?php


function processa(Integer $id, Float $valor)
{
echo $id, $valor;
}

processa(new Integer($id), new Float($valor));

<?php


function processa(SplInt $id, SplFloat $valor)
{
echo $id, $valor;
}

processa(new SplInt($id), new SplFloat($valor));

<?php

$int = new SplInt('10');
// ?

<?php

// UnexpectedValueException: Value not an integer

<?php

$int = new SplInt('10', false);
// Ok

<?php


if (!is_int('10'))

$int1 = new SplInt('10', false);
$int2 = '10';

if (!is_int($int2))
$int2 = (int) $int2;

<?php

$int = new SplInt(10);
$int = 10;

$int1 = new SplInt('10', false);
$int1 = '10';

<?php

$int = new SplInt(10);
$float = new SplFloat(10.7);

echo $float + $int;
echo $float - $int;
echo $float / $int;
echo $float * $int;

<?php


function processa(SplInt $id, SplFloat $valor)
{
echo $id, $valor;
}

// Catchable fatal error: Argument 1 passed to processa() must be an instance of SplInt
// Catchable fatal error: Argument 2 passed to processa() must be an instance of SplFloat

<?php

class Month extends SplEnum
{
const __default = self::January;

const January = 1;
const February = 2;
const March = 3;
const April = 4;
const May = 5;
const June = 6;
const July = 7;
const August = 8;
const September = 9;
const October = 10;
const November = 11;
const December = 12;
}

<?php

{

const January = 1;
const February = 2;
const March = 3;
const April = 4;
const May = 5;
const June = 6;
const July = 7;
const August = 8;
const October = 10;
}

function getMonth(Month $month)
{
echo $month;
}

getMonth(new Month(Month::October));

<?php

{

const January = 1;
const February = 2;
const March = 3;
const April = 4;
const May = 5;
const June = 6;
const July = 7;
const August = 8;
const October = 10;
}

function getMonth(Month $month)
{
echo $month;
}

getMonth(new Month(13));
// UnexpectedValueException: Value not a const in enum Month

<?php

{

const January = 1;
const February = 2;
const March = 3;
const April = 4;
const May = 5;
const June = 6;
const July = 7;
const August = 8;
const October = 10;
}

$month = new Month();
var_dump($month->getConstList());

<?php

function foo(array $value)
{
// ...
}

<?php

function testInt(integer $value)
{
var_dump($value);
}

testInt(1);

http://svn.php.net/viewvc?
view=revision&revision=299534

https://svn.php.net/repository/php/php-src/
branches/WITH_SCALAR_TYPES/

http://ilia.ws/archives/207-Type-Hinting-
Conclusion.html

<?php

function testInt(integer $value)
{
var_dump($value);
}

testInt('PHPubSP');
// Catchable fatal error: Argument 1 passed to testInt() must be of the type integer,
string given

<?php

function testNumeric(numeric $value)
{
var_dump($value);
}

testNumeric('10');

<?php

function testCast((int) $value)
{
var_dump($value);
}

testCast('10');

<?php

function testScalar(scalar $value)
{
var_dump($value);
}

testScalar('10');

<?php

function testBool(bool $value)
{
// ...
}

function testString(string $value)
{
// ...
}

function testFloat(float $value)
{
// ...
}

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