Php 5.3: New Language Features

PHP 5.3: New Language Features Sebastian Bergmann July 14th  2009

Who I am 

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Sebastian Bergmann Involved in the PHP project since 2000 Creator of PHPUnit Co-Founder and Principal Consultant with thePHP.cc

PHP 5.3 New Language Features 

Lambda Functions

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Closures

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Functors

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Late Static Binding

\

Namespaces

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goto

PHP 5.3 Other Improvements 

New extensions 

phar, intl, fileinfo

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Garbage Collector

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MySQL Native Driver

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Improved Windows support

PHP 5.3 Performance Improvements

30

20

10

0

PHP 5.0.5

PHP 5.1.6

PHP 5.2.10 PHP 5.3.0

Lambda Functions In a nutshell

Anonymous functions that 

are declared on-the-fly,

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can be assigned to a variable,

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and passed to other functions

Lambda Functions Usage

Lambda Functions Usage Hello World!

Lambda Functions Usage Hello World!

Lambda Functions Usage Hello World!

Lambda Functions Usage Scenarios Array ( [0] [1] [2] [3] )

=> => => =>

4 19 22 78

Lambda Functions Usage Scenarios Array ( [0] [1] [2] [3] [4] )

=> => => => =>

1 8 27 64 125

Lambda Functions Prior to PHP 5.3 Hello World!

Lambda Functions Prior to PHP 5.3 Hello World!

Lambda Functions Prior to PHP 5.3 Hello World!

Closures In a nutshell

Anonymous functions that 

are declared on-the-fly,

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can be assigned to a variable,

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passed to other functions,

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and remember what happens around them

Closures Lexical Variables Hello World!

Closures Lexical Variables Array ( [0] => 101 [1] => 102 [2] => 103 )

Closures Y-Combinator
}

return $func( function ($f) use($F) { return $F( function ($x) use($f) { $ff = $f($f); return $ff($x); } ); } );

http://en.wikipedia.org/wiki/Fixed_point_combinator

Closures Lexical Variables with references 1 1 1 2

Closures Reflection API Closure [ <user> function {closure} ] { @@ /home/sb/closure_reflection.php 2 - 2 - Parameters [2] { Parameter #0 [ <required> $a ] Parameter #1 [ <required> $b ] } }

Functors In a nutshell 

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Allow an object to be invoked or called as if it were an ordinary function Can be used to implement stateful callbacks Also called function objects, functionals or functionoids

Functors Usage Example::__invoke

Static Binding Early Static Binding Base::a Base::b

Static Binding Late Static Binding Base::a Child::b

Namespaces Declaration a.php

Namespaces Fully qualified names a.php b.php

Namespaces Import from namespace into local scope a.php c.php

Namespaces Import from namespace into local scope (conflict) a.php c.php Fatal error: Cannot use project\SomeClass as SomeClass because the name is already in use in /tmp/c.php on line 6

Namespaces Import from namespace into local scope with alias a.php d.php

The End Thank you for your interest! These slides will be posted on http://slideshare.net/sebastian_bergmann

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