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(); }

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