the new feature

php7.php

<?php 

/**
 * Scalar type declarations
 */

//declare(strict_types=1);

function add(int $a, int $b){
	return $a + $b;
}

var_dump(add(1,2));
var_dump(add("1","2"));

/**
 * Anonymous classes
 */
/* $foo = new Class{
 	public function foo(){
 		return "bar";
 	}
 };
 var_dump($foo,$foo->foo());*/


 /**
  * Closure::call()
  */
/* class Foo{
 	private $foo = 'bar';

 }
 $getFooCallBack = function(){
 	return $this->foo;
 };
 //PHP5 style
 $binding = $getFooCallBack->bindTo(new Foo,'Foo');
 echo $binding().PHP_EOL;
 //PHP7 style
 echo $getFooCallBack->call(new Foo).PHP_EOL;*/

/**
 * Generator delegation
 */
/*function gen(){
	yield 1;
	yield 2;
	yield from gen2();
}
function gen2(){
	yield 3;
	yield 4;

}
foreach(gen() as $val){
	echo $val, PHP_EOL;
}*/

/**
 *	Generator return expressions
 * 
 */
/*$gen = (function(){
	yield 1;
	yield 2;

	return 3;
})();
foreach($gen as $val){
	echo $val, PHP_EOL;
}
echo $gen->getReturn(), PHP_EOL;*/

/**
 * NULL coalesce operator
 */

/*$array = ['foo'=>'bar'];

//PHP5 style
$message = isset($array['foo'])? $array['foo'] : 'not set';
echo $message.PHP_EOL;

//PHP7 style
$message = $array['foo'] ?? 'not set';
echo $message.PHP_EOL;*/

/**
 * Space ship operator
 */
/*$array = [
	"1 <=> 1" => 1 <=> 1,
	"1 <=> 2" => 1 <=> 2,
	"2 <=> 1" => 2 <=> 1
];
var_dump($array);*/

/**
 * Throwable interface
 */

/*try{
	sqdf();

}catch(Throwable $t){
	echo "Throwable: ".$t->getMessage().PHP_EOL;
}

//Exception as Throwable
try{
	throw new Exception('Bla');
}catch(Throwable $t){
	echo "Throwable: ".$t->getMessage().PHP_EOL;
}
//Error
try{
	sqdf();
}catch(Throwable $t){
	echo "Error: ".$t->getMessage().PHP_EOL;
}catch(Exception $e){
	echo "Exception: ".$t->getMessage().PHP_EOL;
}

//Exception
// try{

// }catch()*/

/**
 * Dirname levels
 */

/*echo dirname('usr/local/bin').PHP_EOL;
echo dirname('usr/local/bin',1).PHP_EOL;
echo dirname('usr/local/bin',2).PHP_EOL;
echo dirname('usr/local/bin',3).PHP_EOL;*/

/**
 * Int division
 */
/*var_dump(
	intdiv(10,3),
	(10/3)
);*/

/**
 * Uniform variable syntax
 */

/*Expression
$$foo['bar']['baz']	
$foo->$bar['baz']
$foo->$bar['baz']()
Foo::$bar['bar']()

PHP5 interpretation
${$foo['bar']['baz']}
$foo->{$bar['baz']}
$foo->{$bar['baz']}()
Foo::{$bar['baz']}()

PHP7 interpretation
($$foo)['bar']['baz']
($foo->$bar)['baz']
($foo->$bar)['baz']()
(Foo::$bar)['baz']()
*/