php 5.3: new language features

8/14/2019 PHP 5.3: New Language Features

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PHP 5.3: New Language FeaturesSebastian Bergmann

July 14th 2009


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Who I am

Sebastian Bergmann Involved in the PHP

project since 2000

Creator of PHPUnit Co-Founder and

Principal Consultantwith thePHP.cc
http://sebastian-bergmann.de/http://thephp.cc/http://thephp.cc/http://sebastian-bergmann.de/


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PHP 5.3

Lambda Functions Closures

Functors

Late Static Binding\ Namespaces

goto

New Language Features


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PHP 5.3

New extensions phar, intl, fileinfo

Garbage Collector

MySQL Native Driver Improved Windows support

Other Improvements


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PHP 5.3Performance Improvements

PHP 5.0.5 PHP 5.1.6 PHP 5.2.10 PHP 5.3.0

0

10

20

30


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Lambda Functions

Anonymous functions that are declared on-the-fly,

can be assigned to a variable,

and passed to other functions

In a nutshell


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Lambda FunctionsUsage


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Hello World!


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Hello World!


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Hello World!


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Lambda FunctionsUsage Scenarios

Array(

[0] => 4[1] => 19[2] => 22[3] => 78

)


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Lambda FunctionsUsage Scenarios

Array(

[0] => 1[1] => 8

[2] => 27[3] => 64[4] => 125

)


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Lambda FunctionsPrior to PHP 5.3


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Closures

Anonymous functions that are declared on-the-fly,

can be assigned to a variable,

passed to other functions, and remember what happens around them

In a nutshell


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ClosuresLexical Variables

Hello World!


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ClosuresLexical Variables

Array(

[0] => 101[1] => 102[2] => 103

)


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ClosuresY-Combinator


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ClosuresLexical Variables with references

11

1

2


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ClosuresReflection API

Closure [ function {closure} ] {

@@ /home/sb/closure_reflection.php 2 - 2

- Parameters [2] {Parameter #0 [ $a ]Parameter #1 [ $b ]

}

}


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FunctorsIn a nutshell

Allow an object to be invoked or called asif it were an ordinary function

Can be used to implement statefulcallbacks

Also called function objects, functionals orfunctionoids


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FunctorsUsage

Example::__invoke

d


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Static BindingEarly Static Binding

Base::a

Base::b

d


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Static BindingLate Static Binding

Base::a

Child::b


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NamespacesDeclaration

a.php


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NamespacesFully qualified names

a.php

b.php

N


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NamespacesImport from namespace into local scope

a.php

c.php

N


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NamespacesImport 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

N


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NamespacesImport from namespace into local scope with alias

a.php

d.php

Th E d


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The End

Thank you for your interest!

These slides will be posted on

http://slideshare.net/sebastian_bergmann

Li
http://slideshare.net/sebastian_bergmannhttp://slideshare.net/sebastian_bergmann


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License

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