PHP7 anonymous classes, Introduction to new features such as import class and closure usage

Anonymous Class (PHP 7)

It is now supported to instantiate an anonymous class with the new class, which can be used instead of some full-burn class definitions.

<?phpinterface Logger {Public Function log (string $msg);} Class Application {private $logger; public function GetLogger (): Logger {   return $this->logger;} public function Setlogger (Logger $logger) {   $this->logger = $logger;}} $app = new Application; $app->setlogger (new class implements Logger {public function log (string $msg) {  echo $msg; }}); Var_dump ($app->getlogger ());? >

The above routines will output:

Object (class@anonymous) #2 (0) {
}

Closure::call () (PHP 7)

Closure::call () now has better performance, a short, skilful way to temporarily bind a method to a closure on an object and invoke it.

<?phpclass A {Private $x = 1;} Pre PHP 7 CODE$GETXCB = function () {return $this->x;}; $getX = $getXCB->bindto (new A, ' a '); Intermediate Closureecho $getX ();//PHP 7+ code$getx = function () {return $this->x;}; Echo $getX->call (new A);

The above routines will output:

1
1

Provides filtering for Unserialize () (PHP 7)

This feature is designed to provide a more secure way of unpacking unreliable data. It prevents potential code injection by using a whitelist approach.

<?php//converts all objects into php_incomplete_class object$data = Unserialize ($foo, ["allowed_classes" = false] );//converts all objects into Php_incomplete_class object except those of MyClass and Myclass2$data = Unserialize ($foo, [ "Allowed_classes" = ["MyClass", "MyClass2"]);//default behaviour (same as omitting the second argument) that accepts All Classes$data = Unserialize ($foo, ["allowed_classes" = true]);

Group Use declarations (PHP 7)

Classes, functions, and constants imported from the same namespace can now be imported once with a single use statement.

<?php//Pre php 7 codeuse some\namespace\classa;use some\namespace\classb;use SOME\NAMESPACE\CLASSC as C;use function Some\namespace\fn_a;use function Some\namespace\fn_b;use function Some\namespace\fn_c;use const some\namespace\ Consta;use Const Some\namespace\constb;use Const some\namespace\constc;//PHP 7+ codeuse Some\namespace\{classa, ClassB , ClassC as C};use function some\namespace\{fn_a, Fn_b, Fn_c};use const Some\namespace\{consta, CONSTB, CONSTC};? >