PHP: Get PHP's variables, functions, constants from a php file

Question

Is there a way to get user-defined php functions, variables, constants from a php file? Following functions are not the best way to do so because they get all decalred funct

Answer 1

To get all variables defined in a file

$init_var = get_defined_vars();
include_once('file_to_check.php');
$init_var2 = get_defined_vars();
unset($init_var2['init_var']);
$variables_defined_in_file = array_diff_key($init_var2, $init_var));
var_dump($variables_defined_in_file);

you should repeat above code by replacing get_defined_vars() for

get_defined_vars()  
get_defined_functions()  
get_defined_constants()