PHPのお勉強！

PHP TOP
PHP 8.4.2 Released!

    FFI::cast

    (PHP 7 >= 7.4.0, PHP 8)

    FFI::cast — Performs a C type cast

    説明

    public FFI::cast(FFI\CType|string $type, FFI\CData|int|float|bool|null &$ptr): ?FFI\CData

    FFI::cast() creates a new FFI\CData object, that references the same C data structure, but is associated with a different type. The resulting object does not own the C data, and the source ptr must survive the result. The C type may be specified as a string with any valid C type declaration or as FFI\CType object, created before. Any type declared for the instance is allowed.

    パラメータ

    type

    A valid C declaration as string, or an instance of FFI\CType which has already been created.

    ptr

    The handle of the pointer to a C data structure.

    戻り値

    Returns the freshly created FFI\CData object.

    変更履歴

    バージョン 説明
    8.3.0 Calling FFI::cast() statically is now deprecated.

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 1 note

    up
    -3
    Yaner
    2 years ago
    For example, stdlib.h headfile defines a function called "system()" in Linux: extern int system (const char *__command) __wur;
    And we can call it using FFI extension:

    <?php
    $ffi_obj     = FFI::cdef('int system(char *command);')
    $ffi_obj->system('whoami');
    ?>

    Then execute the php script as if we were calling the real C `system()`:

    $ whoami
    > root
    $ php demo.php
    > root
    ＋add a note
    To Top