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    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 {
    /* 常量 */
    const string V8_VERSION;
    const int FLAG_NONE = 1;
    const int FLAG_FORCE_ARRAY = 2;
    /* 方法 */
    public __construct(
        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): mixed
    public static getExtensions(): array
    public getPendingException(): V8JsException
    public static registerExtension(
        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

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    User Contributed Notes 4 notes

    up
    24
    mateusz dot charytoniuk at gmail dot com
    10 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.
    up
    5
    Hoffmann dot P-no-sp at m-gmx dot net
    6 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)
    up
    5
    mateusz dot charytoniuk at gmail dot com
    8 years ago
    v8js can be also used to render server-side javascript components (see: React.js).
    up
    -7
    stamster at gmail dot com
    6 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.
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