(PECL runkit7 >= Unknown)
runkit7_import — Process a PHP file importing function and class definitions, overwriting where appropriate
$filename, int $flags = ?): bool
   Similar to include. However, any code residing outside
   of a function or class is simply ignored.
   Additionally, depending on the value of flags,
   any functions or classes which already exist in the currently running environment
   may be automatically overwritten by their new definitions.
  
filenameFilename to import function and class definitions from
flags
       Bitwise OR of the RUNKIT7_IMPORT_*
       family of constants.
     
   成功时返回 true, 或者在失败时返回 false。