An article to talk about the features of php5.6 [Summary]

This article will talk about the features of php5.6 (constants as default values ​​of function parameters, variable function parameters, namespaces, etc.). If you need it, you can take a look. I hope it will be helpful to everyone!

Better constants

Allows the use of previously defined constants when defining constants Calculation:

const A = 2;
const B = A + 1;
class C
{
    const STR = "hello";
    const STR2 = self::STR + ", world";
}

Allow constants as function parameters Default value:

function func($arg = C::STR2)

Better variable function parameters

Used to replace func_get_args()

function add(...$args)
{
    $result = 0;
    foreach($args as $arg)
        $result += $arg;
    return $result;
}

At the same time, when calling the function, the array can be expanded into function parameters:

The code is as follows:

$arr = [2, 3];
add(1, ...$arr);

// 结果为 6

Namespace

Namespace supports constants and functions:

namespace Name\Space {
    const FOO = 42;
    function f() { echo __FUNCTION__."\n"; }
}
namespace {
    use const Name\Space\FOO;
    use function Name\Space\f;
    echo FOO."\n";
    f();
}

Recommended learning: "PHP Video Tutorial"

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