php Restricting function call to certain class

Question

I have a class named db.php..... and I have the following method in it.

function query($sql){
   return mysql_query($sql);
}

I want that only this class can use

mysql_query

but others can't. And others can only use by calling the

$db->query

function of this class.

Is it possible? Any help would be greatly appreciated!

Answer 1

I am pretty sure this can be achieved in an indirect way. You can rename the function and then call it again if you want:

rename_function('mysql_query', 'mysql_query_old' );

function mysql_query(){
  //do whatever
  //pass the call to original method if needed.
  $args = func_get_args();
  if (count($args) === 2)
    return mysql_query_old($args[0], $args[1]);
  else
    return mysql_query_old($args[0]);
}

To restrict it to a certain class only, you could just check the calling class:

$trace = debug_backtrace()[1];
$class = $trace['class'];

Take a look here and here for more info: