Description
array 
get_defined_functions ( void  )
     This function returns an multidimensional array containing a list of
     all defined functions, both built-in (internal) and user-defined. The 
     internal functions will be accessible via
     $arr["internal"], and the user defined ones using
     $arr["user"] (see example below).
    
     
    
     See also
     function_exists(),
     get_defined_vars() and 
     get_defined_constants().