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Copyright 2009 thePHP.cc, Germany

Migrating to PHP 5.3

Stefan Priebsch

July 31st 2009

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Premium PHP Consulting & Training. Worldwide.

ArneBlankerts

SebastianBergmann

StefanPriebsch

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Why PHP 5.3?

Faster Better tested

Officially supported on all Windows platforms

Loads of new features

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Selected PHP 5.3 Highlights

Namespaces Late Static Binding

New extensions: fileinfo, intl, Phar

New datastructures in SPL SQLite3

mysqlnd

Garbage Collection

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Namespaces

Work for classes, functions and constants Namespace separator: \

Work like directory navigation

Relative Pathnamespace foo\bar + class baz = foo\bar\baznamespace foo + class bar\baz = foo\bar\baz

Absolute Path

namespace foo\bar + class \baz = \baz Prepend built-in classes and functions with \

throw new \Exception

\strlen(...)

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Namespaces Example

namespace my\Application\Models;use Framework\Model\ModelBase as Model;

class UserModel extends Model

{...

}

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Late Static Binding Example

class BaseClass{static protected $foo = 'foo';

static public function getFoo()

{return self::$foo;

}}

var_dump(BaseClass::getFoo());

Will output: string(3) "foo"

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Late Static Binding Example

class SubClass extends BaseClass{static protected $foo = 'bar';

}

var_dump(SubClass::getFoo());

Will output: string(3) "foo"

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Late Static Binding Example

class BaseClass{static protected $foo = 'foo';

static public function getFoo()

{return static::$foo;

}}

var_dump(SubClass::getFoo());

Will output: string(3) "bar"

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Late Static Binding Example

class SomeClass{static public function foo(){

var_dump('foo method');

}}

$classname = 'SomeClass';

$classname::foo();

Will output: string(10) "foo method"

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Phar

PHP Archive Stream wrapper-based

PHP extension + Userland implementation

Can be executable No temporary files involved

php.ini: phar.readonly=Off;

You cannot set this at runtime!

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Migration Problems

Environment Old Extensions

Compile-time errors

Name Conflicts More strictness

Runtime errors

New error messages (E_DEPRECATED) Logic errors

Altered behaviour

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Altered function behaviour

$haystack = 'hello world';$needle = 'lo';

var_dump(strrpos($haystack, $needle));

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Altered function behaviour

$haystack = 'hello world';$needle = 'lo';

var_dump(strrpos($haystack, $needle));

PHP 4: int(9)

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Altered function behaviour

$haystack = 'hello world';$needle = 'lo';

var_dump(strrpos($haystack, $needle));

PHP 4: int(9)

PHP 5: int(3)

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Solution: Create a wrapper

function strrpos_wrapper($haystack,$needle,$offset = 0)

{return strrpos($haystack,

substr($needle, 0, 1),$offset);

}

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More Strictness

abstract class Test{ abstractstatic function foo();}

Strict standards:Static function should not be abstract

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More Strictness

abstract class Test{ abstractprivate function foo();}

Fatal error:Abstract function cannot be declared private

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Useful Tools

Lint: php -l Validators (HTML, XML, CSS, JS)

PHPUnit

http://www.phpunit.de Selenium

http://seleniumhq.org

xdebug http://www.xdebug.org

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xdebug Function Trace

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Mocking

include_once './library/function.php';

for($i = 0; $i < 5; $i++) {var_dump(get_random_value());

}

library/function.php:

function get_random_value(){

return rand(1, 10);}

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Mocking

mock_library/function.php:

function get_random_value(){

static $i = 0;static $random_values =array(1, 2, 3, 4, 5);

return $random_values[$i++];

}

k

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Mocking

include_once './mock_library/function.php';

for($i = 0; $i < 5; $i++) {var_dump(get_random_value());

}

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How To Migrate

Fix errors/warnings/notices Normalize the PHP configuration

Set up two test systems, old and new

Do A/B testing Compare the results

Fix the problems

Switch the production system

f fi i

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Future-Proof PHP Configuration

ze1.compatibility_mode=Off allow_call_time_pass_reference=Off

register_globals=Off

magic_quotes_*=Off register_long_arrays=Off

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http://www.phparch.com/books/index

C d W k '09 W k h

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Code Works '09 Workshops

Advanced OOP and Design Patterns PHP Code Review with Arne Blankerts

and Sebastian Bergmann

http://cw.mtacon.com

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Copyright 2009 thePHP.cc, Germany

Thank You. http://thePHP.cc

http://www.priebsch.de http://www.slideshare.net/spriebsch

http://twitter.com/spriebsch

stefan@thePHP.cc, IRC: spriebsch