new stuff in php 5.4

5.4.php

<?php
/**
 * `<?=` jest zawsze dostępny, niezależnie od ustawienia `short_open_tag`
 */


/**
 * use newly created object on the fly
 */
$this->addFoo(
    (new HGZ_Foo)->setStuff($stuff)
);


/**
 * use {} to specify static method names
 */
$method = 'method';
$tst = new Test();

$tst->method() === $tst->$method() === $tst->{'method'}();
Test::method() === Test::$method() === Test::{'method'}(); // last one is new


/**
 * function result's index!
 */
function fruit () {
    return array('a' => 'apple', 'b' => 'banana');
}
echo fruit()['a'];


/**
 * `callable` typehint: everything that `is_callable`
 */
function foo(callable $cb) {
    $cb();
}


/**
 * calling *all* the `callable`s
 */
$foo = array($obj, 'method');   $foo();
$foo = 'func';                  $foo();
$foo instanceof Closure;        $foo();


/**
 * short array syntax
 */
$a = [1, 2, 3];
$b = ['foo' => 'orange', 'bar' => 'apple', 'baz' => 'lemon'];


/**
 * binary notation
 */
$x = 0b001110;
echo $x;


/**
 * traits
 */
class Base {
    public function sayHello() {
        echo 'Hello';
        return $this;
    }
}
 
trait SayWorld {
    public function sayHello() {
        parent::sayHello();
        echo ' World';
        return $this;
    }
    public function emphasise() {
        echo '!';
    }
}

trait Internet {
    public function emphasise() {
        echo '!!!shiftplusone';
    }
}
 
class MyHelloWorld extends Base {
    use SayWorld, Internet;
}
 
$o = new MyHelloWorld();
$o->sayHello()->emphasise(); // prints "Hello World!!!shiftplusone";

// much more on traits: http://php.net/manual/en/language.oop5.traits.php


/**
 * Native upload process
 */
?>
<form action="upload.php" method="POST" enctype="multipart/form-data">
    <input type="hidden" name="<?= ini_get("session.upload_progress.name") ?>" value="kewlUpload" />
    <input type="file" name="file1" />
    <input type="file" name="file2" />
    <input type="submit" />
</form>
<?php
$key = ini_get("session.upload_progress.prefix") . ini_get("session.upload-progress.name");
$_SESSION[$key]; // data about uploading

// more on that: http://docs.php.net/manual/en/session.upload-progress.php


/**
 * Added built-in web server that is intended for testing purpose.
 */
`php -S localhost:8000`;
// or
`php -S localhost:8000 router.php`;

// more on that: http://www.php.net/manual/en/features.commandline.webserver.php


/**
 * Lots of performance and memory usage improvements
 * including improved performance of @ (silence) operator.
 */


/**
 * Improved parse error messages and improved incompatible arguments warnings.
 */



// sources: http://php.net/releases/5_4_0.php
//          http://php.webtutor.pl/en/2011/09/27/whats-new-in-php-5-4-a-huge-list-of-major-changes/