(PECL runkit7 >= Unknown)
runkit7_function_rename — Change a function's name
$funcname
   , string $newname
   ) : boolNote: By default, only userspace functions may be removed, renamed, or modified. In order to override internal functions, you must enable the
runkit.internal_overridesetting in php.ini.
funcnameCurrent function name
newnameNew function name
   Returns TRUE on success or FALSE on failure.