The document discusses the new features introduced in PHP 5.5, including support for generators with the 'yield' keyword, a new password hashing API to enhance security, and improvements to various built-in functions like 'empty()'. It also highlights changes to how arrays and strings can be dereferenced, and mentions the introduction of Zend Optimizer+ for performance enhancements. Additionally, the document notes deprecated features and provides various resources for further exploration of PHP 5.5 developments.

1. WHAT'S NEW IN PHP 5.5
·Corey Ballou @cballou

2. GENERATORS
Support for generators has been added via the yield keyword
range(0, 1000000)vs. user supplied function

3. EXAMPLE USAGE OF YIELD KEYWORD
function getLines($filepath) {
$f = fopen($filepath, 'r');
try {
while ($line = fgets($f)) {
yield $line;
}
} finally {
fclose($f);
}
}
foreach (getLines("file.txt") as $n => $line) {
echo $line;
}

4. THE "FINALLY" KEYWORD IS FINALLY HERE
Execute code ALWAYS.
try {
throw new Exception('hello');
} catch (Exception $e) {
echo $e->getMessage();
} finally {
// this code will always be run
echo ', world';
}

5. PASSWORD HASHING API
A super easy library that uses underlying crypt library.
password_get_info()
password_hash()
password_needs_rehash()
password_verify()

6. EXAMPLE OF REGISTER/LOGIN
function register($username, $password) {
$hash = password_hash($password, PASSWORD_BCRYPT);
// save hash to database
}
function login($username, $password) {
$hash = getHashFromDbByUsername($username);
if (password_verify($password, $hash)) {
// perform login (store session var)
return true;
}
return false;
}

7. INCREASING PASSWORD SECURITY
You can optionally supply your own salt and algorithmic cost.
function register($username, $password) {
$options = array('salt' => 'someRandomSalt', 'cost' => 12);
$hash = password_hash($password, PASSWORD_BCRYPT, $options);
// save hash to database
}

8. EXAMPLE OF UPGRADING YOUR HASHING
ALGORITHM
function login($username, $password) {
$hash = getHashFromDbByUsername($username);
if (password_verify($password, $hash)) {
// check if hash is in updated format
if (password_needs_rehash($hash, PASSWORD_BCRYPT)) {
// perform update
$hash = password_hash($password, PASSWORD_BCRYPT);
// save new hash to database
}
// perform login (store session var)
return true;
}
return false;
}

9. FOREACH + LIST
$array = [
[1, 2],
[3, 4],
];
foreach ($array as list($a, $b)) {
echo "A: $a; B: $bn";
}

10. ARRAY_COLUMN()FUN
$people = [
[
'firstname' => 'John',
'lastname' => 'Doe'
],
[
'firstname' => 'Jane',
'lastname' => 'Doe'
],
];
// contains [ 0 => 'John', 1 => 'Jane' ]
$firstnames = array_column($people, 'firstname');

11. IMPROVEMENTS TO EMPTY()
function always_false() {
return false;
}
if (empty(always_false())) {
echo "Hello, world.";
}

12. ARRAY AND STRING LITERAL DEREFERENCING
// array dereferencing
echo [1, 2, 3][0];
// string dereferencing
echo 'PHP'[0];

13. NOW LET'S REALLY GET CRAZY...
function foo() {
return array(1, 2, 3);
}
echo foo()[2]; // prints 3
$func = function() { return array('a', 'b', 'c'); };
echo $func()[0]; // prints a

14. ZEND OPTIMISER+ OPCACHE EXTENSION
Not a replacement for APC/memcache(d). No user cache!
Available in PHP 5.4 via install.
Source available: https://github.com/zend-
dev/ZendOptimizerPlus
$ php -v
PHP 5.4.17RC1 (cli) (built: Jun 22 2013 19:27:26)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
with Zend OPcache v7.0.2, Copyright (c) 1999-2013, by Zend Technolo
gies

15. SO, UH, WHAT IS AN OPCODE CACHE?
Component designed to speed up performance of PHP
without altering the app.
Overrides PHP's default compiler callback by checking if a
compiled intermediate-code version of the code is
available in-memory.
It skips compilation when it can!

16. WHAT TO DO ABOUT DEPRECATED APC
MODULE?
APC User Cache is in the works:
APC minus the opcode cache!
github.com/krakjoe/apcu

17. BACKWARDS INCOMPATIBLE CHANGES
Win XP/2003 support dropped
self, parent and static are case insensitive
pack()and unpack()made more compatible with perl
http://www.php.net/manual/en/migration55.deprecated.php

18. CREDITS
php.net - What has changed in PHP 5.5.x
wiki.php.net - Integrating Zend Optimizer+ into the PHP
distribution
schlueters.de - Features in PHP trunk: Array
dereferencing
slideshare.net - What's new in PHP 5.5
stackoverflow.com - How do you use bcrypt for hashing
passwords in PHP?

19. QUESTIONS? COMMENTS?
Thanks for pretending to enjoy my banter!