FFI::cast

(PHP 7 >= 7.4.0)

FFI::cast — Performs a C type cast

说明

public static FFI::cast ( mixed $type , FFI\CData &$ptr ) : FFI\CData

public FFI::cast ( mixed $type , FFI\CData &$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. 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.

参数

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.

返回值

Returns the freshly created FFI\CData object.