# FFI::cast

(PHP 7 >= 7.4.0, PHP 8)

FFI::cast — Performs a C type cast

### 说明

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.

### 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.

### 更新日志

版本 | 说明
--- | ---
8.3.0 | Calling FFI::cast() statically is now deprecated.

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