overloading conditionally in php - php

Question

Might be I am missing something obvious.
I have a native class with set and get method.
class DBStorage extends NativeClass{
public function get($key);
public function set($key,value);
}
I would like to use that most of the time, but, if I turn on the system DEBUG flag.
I would like the set and get methods to be overloaded with the following:
IF DEBUG IS ON{
class DBStorage extends NativeClass{
public function get($key){
var_dump($key);
parent::get($key);
}
public function set($key,$value){
var_dump($key,$value);
parent::set($key,$value);
}
}
}
NativeClass is written in C. It is an extension (phpredis, but it is not relevant).
How would I accomplish this?
I am on the 5.3 branch of PHP.
just to make sure...if debug is off, DBStorage will be:
class DBStorage extends NativeClass{}
if debug is on, it will be:
class DBStorage extends NativeClass{
public function get($key){
var_dump($key);
parent::get($key);
}
public function set($key,$value){
var_dump($key,$value);
parent::set($key,$value);
}
}
I do try to avoid the cluttring of IFs (there are dozens of functions in the real class)
public function get($key) {
if (DEBUG) {
var_dump($key);
}
return parent::get($key);
}

Answer 1

You can't conditionally overload, but you can conditionally do something in the overloaded method:
class DBStorage extends NativeClass{
public function get($key) {
if (DEBUG) {
var_dump($key);
}
return parent::get($key);
}
}
If debug is off, it passes the arguments right through to the parent method and returns the parent's return value, as if nothing happened.

Answer 2

Your initial code won't compile, because of the if around the class construct. Why not just make available a debug member variable, and if true, echo output, or push into a log file?
class NativeClass
{
public $debug = false;
}
class DBStorage extends NativeClass
{
public function get($key)
{
if (true === $this->debug) {
error_log(sprintf('Key: %s', $key));
}
parent::get($key);
}
}
// Calling code
$dbo = new DBStorage();
$dbo->debug = true;
$dbo->doStuff();

Answer 3

something just came to me
class nodebug extends NativeClass{
static public function create(){
if(DEBUG) return new DebugNativeClass;
return new self;
}
}
class DebugNativeClass extends nodebug{
public function set($key,$value){
var_dump($key,$value);
parent::set($key,$value);
}
public function get($key){
var_dump($key);
return parent::set($key);
}
}