FFI::cdef

(PHP 7 >= 7.4.0, PHP 8)

FFI::cdef — Creates a new FFI object

说明

public static FFI::cdef ( string $code = "" , string|null $lib = null ) : FFI

Creates a new FFI object.

参数

code: A string containing a sequence of declarations in regular C language (types, structures, functions, variables, etc). Actually, this string may be copy-pasted from C header files.

Note:
C preprocessor directives are not supported, i.e. #include, #define and CPP macros do not work.
lib: The name of a shared library file, to be loaded and linked with the definitions.

Note:
If lib is omitted, platforms supporting RTLD_DEFAULT attempt to lookup symbols declared in code in the normal global scope. Other systems will fail to resolve these symbols.

返回值

Returns the freshly created FFI object.

更新日志

版本	说明
8.0.0	`lib` is nullable now.

User Contributed Notes

derrekbertrand at gmail dot com 27-Feb-2020 10:33


You'll probably want to add a C header file, but as of the current version preprocessor directives do not work... so what do? On systems with GCC run the file through this command:



cpp -P /usr/include/unprocessedheader.h -o myprettyheader.h



Note that because preprocessing is not suppored in FFI, C/C++ macros are not supported either. You'll probably still have to write a small wrapper in C unless your library has an exceedingly simple public API.