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
FFI::cast
(PHP 7 >= 7.4.0)
FFI::cast — Performs a C type cast
Descrierea
public static FFI::cast
( FFI\CType|string
$type
, FFI\CData|int|float|bool|null &$ptr
) : FFI\CData|null
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.
If this method is called statically, it must only use predefined C type names (e.g.
int, char, etc.); if the method is called as
instance method, any type declared for the instance is allowed.
Parametri
-
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.
Valorile întoarse
Returns the freshly created FFI\CData object.
add a note
User Contributed Notes 1 note
Yaner ¶
2 years ago
