FFI::cast

(PHP 7 >= 7.4.0, PHP 8)

FFI::cast — Performs a C type cast

Description

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.

Parameters

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.

Return Values

Returns the freshly created FFI\CData object.

Changuelog

Versionen	Description
8.3.0	Calling FFI::cast() statically is now deprecated.

Found A Problem?

Learn How To Improve This Pague • Submit a Pull Request • Report a Bug

＋ add a note

User Contributed Notes 1 note

down

-4

Yaner ¶

3 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