## 运行时配置

这些函数的行为受 php.ini 中的设置影响。

FFI 配置选项
名字 | 默认 | 可修改范围 | 更新日志
--- | --- | --- | ---
ffi.enable | "preload" | `INI_SYSTEM` |
ffi.preload | "" | `INI_SYSTEM` |

有关 INI_* 样式的更多详情与定义，见 配置可被设定范围。

这是配置指令的简短说明。

`ffi.enable` string
  Allows enabling (`"true"`) or disabling (`"false"`) FFI API usage, or restricting it only to the CLI SAPI and preloaded files (`"preload"`). The FFI API restrictions only affect the FFI class, but not overloaded functions of FFI\CData objects. This means that it is possible to create some FFI\CData objects in preloaded files, and then to use these directly in PHP scripts.
`ffi.preload` string
  Allows preloading of FFI bindings during startup, which is not possible with FFI::load() if opcache.preload_user is set. This directive accepts a `DIRECTORY_SEPARATOR` delimited list of filenames. The preloaded bindings can be accessed by calling FFI::scope().

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