PHP

I've been using php for over 10 years. it becomes better and better.

I also learned some other lanugages, php remains one of my favourite language.

You want your own aws lambda and api gateway? simply upload a php script and you've got it.

PHP 7

new features list

Return type declarations

function arraysSum(array ...$arrays): array
turn on strict types by declare(strict_types=1); (usually at the first line like <?php declare(strict_types=1);)

too java?? I think it's a good thing. optional typed is a big win IMHO.

Null coalescing operator

no more isset() checks

$username = $_GET['user'] ?? 'nobody';

define() constant arrays

define('ANIMALS', [
    'dog',
    'cat',
    'bird'
]);

Anonymous classes

WTF?? I hate it.

Group use declarations

use some\namespace\{ClassA, ClassB, ClassC as C};
use function some\namespace\{fn_a, fn_b, fn_c};
use const some\namespace\{ConstA, ConstB, ConstC};

Generator::getReturn()

read the documentation

PHP 5.6

new features list

variadic functions

function f($req, $opt = null, ...$params) {
 ...
}
Argument unpacking via ...
$operators = [2, 3];
echo add(1, ...$operators);

use function and use const

namespace {
    use const Name\Space\FOO;
    use function Name\Space\f;

    ...
}

PHP 5.5

new features list

generator

read the documentation

when you code arrives yield, it returns and suspends, so it is like lazy

finally

try ... catch ... finally

documentation

password_hash()

the correct way to handle password hashing, read the documentation

PHP 5.4

new features list

Short array syntax

like javascript, $a = [1, 2, 3, 4];

Class member access on instantiation

one of my favourite change: (new Foo)->bar()

built-in web server

read the documentation

traits

documentation

(the reason to use trait instead of static class methods, is you can access private / protected properties / methods.)

trait Hello {
    public function sayHello() {
        echo 'Hello ';
    }
}

trait World {
    public function sayWorld() {
        echo 'World';
    }
}

class MyHelloWorld {
    use Hello, World;
    public function sayExclamationMark() {
        echo '!';
    }
}

$o = new MyHelloWorld();
$o->sayHello();
$o->sayWorld();
$o->sayExclamationMark();

closures

documentation

echo preg_replace_callback('~-([a-z])~', function ($match) {
    return strtoupper($match[1]);
}, 'hello-world');
// outputs helloWorld

Composer

use composer, seriously.

Editor

use netbeans, seriously.

Quick note

detect cli mode

if (php_sapi_name() == "cli") { 
  // runs under cli
}

Reference

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