The V8Js class
(PECL v8js >= 0.1.0)
简介
This is the core class for V8Js extension. Each instance created from this class has own context in which all JavaScript is compiled and executed.
See V8Js::__construct() for more information.
类摘要
class V8Js
{
/* Constants */
/* Methods */
public __construct(
string
array
array
bool
)
string
$object_name = "PHP",array
$variables = array(),array
$extensions = array(),bool
$report_uncaught_exceptions = true)
public executeString(string
$script, string $identifier = "V8Js::executeString()", int $flags = V8Js::FLAG_NONE): mixedpublic static registerExtension(
string
string
array
bool
): bool
}string
$extension_name,string
$script,array
$dependencies = array(),bool
$auto_enable = false): bool
预定义常量
V8Js::V8_VERSION-
The V8 Javascript Engine version.
V8Js::FLAG_NONE-
No flags.
V8Js::FLAG_FORCE_ARRAY-
Forces all JS objects to be associative arrays in PHP.
目录
- V8Js::__construct — Construct a new V8Js object
- V8Js::executeString — Execute a string as Javascript code
- V8Js::getExtensions — Return an array of registered extensions
- V8Js::getPendingException — Return pending uncaught Javascript exception
- V8Js::registerExtension — Register Javascript extensions for V8Js
add a note
User Contributed Notes 4 notes
mateusz dot charytoniuk at gmail dot com ¶
8 years ago
This extension can be used to provide server-side and client-side form validation by executing the same JavaScript code at both places.
Hoffmann dot P-no-sp at m-gmx dot net ¶
5 years ago
You can use function variables (jay!)
So the following works:
$add = function ($a, $b) {
return $a + $b;
};
$v8 = new V8Js('PHP', array('add' => 'add'));
$result = $v8->executeString('PHP.add(1,2)');
var_dump($result);
yields indeed:
int(3)
mateusz dot charytoniuk at gmail dot com ¶
6 years ago
v8js can be also used to render server-side javascript components (see: React.js).
stamster at gmail dot com ¶
5 years ago
Take note that just instantiating V8 class / binary .so will add at least 5ms to your app/script runtime.
Test from LAN (minimum network latency):
PHP 7.0.x w/o instantiating V8JS class: 1ms
PHP 7.0.x with V8JS object: 6-7ms
Running V8 engine v5.8.0
It's not a big deal, but comparing to PhalconPHP framework which adds almost 0 additional latency at runtime, V8JS adds 5-6 times more of latency/overhead.