function_exists
Opis
bool function_exists ( string function_name )
Checks the list of defined functions, both built-in (internal) and
user-defined, for function_name
.
Zwracane wartości
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().
Notatki
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).
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