1. What's new in php 5.5
By: Nguyen Thi Huyen-framgia

2. 1. Installation.
2. New features & demo.
3. References.

3. 1. Installation.
- Access website http://bitnami.com/stack/lamp/installer
download “LAMP Stack Dev 5.5.1-0 (64 bit)”.
- Install “./bitnami-lampstack-5.5.1-0-dev-linux-x64-
installer.run” in terminal.

4. 2. New features & demo.
a) Generators.
- Generators are one of the most eagerly
anticipated new features.
- They provide a way to handle iteration without
having to write a class that implements the
Iterator interface.
- Generators derive their functionality from the
new “yield” keyword. A generator looks very
similar to a normal function, but instead of
returning a single value, a generator may yield
any number of values.

5. b) Finally.
PHP 5.5 adds support for the finally keyword. finally allows
developers to specify code to be run at the end of try and
catch blocks, regardless of whether an exception was thrown
or not, before the normal execution flow resumes.
- If you use “finally”, you won use “catch”:
//without catch
function example() {
try {
//do something that throws an exeption
} finally {
//this code will be executed even when the exception is executed
}
}

6. - Code within the FINALLY block will be executed even if the
“return” is called inner try/catch block.
- Code within the FINALLY block will be executed even if
haven't any matching catch block.

7. c) Array and String Literal Dereferencing.
- Array and string literals can now be dereferenced using
array access syntax:
<?php
// array dereferencing - returns 3
echo [1, 3, 5, 7][1];
// string dereferencing - returns "l"
echo "hello"[3];
?>
- This feature was added primarily to improve the
consistency of the language.There are some interesting
applications to consider, such as the following:
<?php
$randomChar = "abcdefg0123456789"[mt_rand(0, 16)];
?>

8. d) Changes to foreach.
The list() construct in PHP allows the values of an array to
be easily assigned to variables.
It’s now possible to use list() with multidimensional arrays
within foreach loops:
<?php
$data = [
["sea", "blue"],
["grass", "green"]
];
foreach ($data as list($object, $description)) {
echo "The $object is $descriptionn";
}
?>
This is a powerful new feature that has the potential to
make iterating through nested arrays much easier and
cleaner.

9. e) Password Hashing.
- The new password hashing API is one of the most
important and useful features added in PHP 5.5. In the
past, developers have had to rely on the somewhat
confusing crypt() function.
public function generatePasswordHash($raw_password)
{
return crypt($raw_password, Randomness::blowfishSalt());
}
public function isValidPassword($raw_password)
{
return crypt($raw_password, $this->password) === $this->password;
}

10. - The new API introduces two new functions:
password_hash() -Creates a password hash
password_verify()-Verifies that a password matches a
hash.
<?php
echo password_hash("rasmuslerdorf", PASSWORD_DEFAULT)."n";
?>
<?php
// See the password_hash() example to see where this came from.
$hash =
'$2y$07$BCryptRequires22Chrcte/VlQH0piJtjXl.0t1XkA8pw9dMXTpOq';
if (password_verify('rasmuslerdorf', $hash)) {
echo 'Password is valid!';
} else {
echo 'Invalid password.';
}
?>

11. Moreover: Using empty() with Function Calls and
Expressions, Class Name Resolution.

12. 3. References.
http://www.sitepoint.com/whats-new-in-php-5-5/.
http://www.php.net/manual/en/book.password.php.
http://www.adayinthelifeof.nl/2013/02/12/php5-5-trycatchfinally/

13. Thank you for listening !