Checks the list of defined functions, both built-in (internal) and
user-defined, for function_name
.
Returns TRUE if function_name
exists and is a
function, FALSE otherwise.
Notatka: This function will return FALSE for constructs, such as include_once() and echo().
Notatka: A function name may exist even if the function itself is unusable due to configuration or compiling options (with the image functions being an example).
Poprzedni | Spis treści | Następny |
func_num_args | Początek rozdziału | get_defined_functions |