PHP 5.4

So what?!

Always prefer the english manual!

Backward Incompatible Changes

Safe mode is no longer supported

Magic quotes has been removed.

The register_globals and register_long_arrays ini directives

have been removed.

Call-time pass by reference has been removed.

The break and continue statements no longer accept variable

arguments.

In the date and time extension, the timezone can no longer be set using

the TZ environment variable.

Non-numeric string offsets - e.g. $a['foo'] where $a is a string - now return false on isset() and true on empty(), and produce a warning if

you try to use them.

Converting an array to a string will now generate an E_NOTICE level

error

The default character set is now UTF-8, instead of ISO-8859-1

New Reserved Keywords

• trait

• callable

• insteadof

New Features

Traits

Short array syntax

• $a = [1, 2, 3, 4];

• $a = ['one' => 1, 'two' => 2, 'three' => 3, 4];

Function array dereferencing

• foo()[0]

Closures now support $this

<?= is now always available, regardless of the short_open_tag ini

option.

Class member access on instantiation has been added

• (new Foo)->bar()

Session Upload Progress

• Session extension can now track the upload progress of files.

• ini settings – session.upload_progress.enabled = true

– session.upload_progress.cleanup = true

– session.upload_progress.prefix = "upload_progress_ "

– session.upload_progress.name = "PHP_SESSION_UPLOAD_PROGRESS "

– session.upload_progress.freq = "1%"

– session.upload_progress.min-freq = 1

Built-in web server in CLI mode

• php -S localhost:8000 -t foo/

• C:\Users\fuhr\Downloads\php-5.4.0-Win32-VC9-x86>.\php -c php.ini-development -S localhost:8181 -t \Users\fuhr\workspace\php54\src

Changed Functions

Stack Frame Limit

• array debug_backtrace ([ int $options = DEBUG_BACKTRACE_PROVIDE_OBJECT [, int $limit = 0 ]] )

• void debug_print_backtrace ([ int $options = 0 [, int $limit = 0 ]] )

New Classes and Interfaces

JsonSerializable

SessionHandler & SessionHandlerInterface

CallbackFilterIterator & RecursiveCallbackFilterIterator

New Methods

SPL

• RegexIterator::getRegex() • SplObjectStorage::getHash() • DirectoryIterator::getExtension() • SplDoublyLinkedList::serialize() • SplDoublyLinkedList::unserialize() • SplFileInfo::getExtension() • SplFileObject::fputcsv() • SplQueue::serialize() • SplQueue::unserialize() • SplStack::serialize() • SplStack::unserialize() • SplTempFileObject::fputcsv()

Further Reading

• http://www.php.net/manual/en/migration54.php

• http://css.dzone.com/articles/writing-clean-code-php-54

• http://net.tutsplus.com/tutorials/php/php-5-4-is-here-what-you-must-know/