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@NogDogFeb 06.2011 — #Not really an OOP question, actually. ? It means that the parameter is "passed by reference", so any changes made to that variable within the function will be applied to the variable passed to it within the calling scope:
@NogDogMar 13.2011 — #Without understanding the bigger picture, I'm hesitant to say that's the "best" solution. It has the "smell" of coupling the class too closely to the application code. What if you want to re-use the class in a situation where you do not want it to increment the supplied argument? Why should the class care whether or not the client code's variable is incremented automatically? Therefore, under the concept of separation of responsibility, for this simple case I would probably favor returning the incremented value, and then letting the calling code decide whether or not to apply it to the argument by using that returned value.
Calling code:
OOP in PHP5 Question…What’s the purpose of "&" in with parameters in methods?
Every now and then I’m seeing
class foo {
function foo1( [COLOR=”Red”]&
}
}
what’s the purpose of this with parameters?
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@NogDogFeb 06.2011 — #Not really an OOP question, actually. ? It means that the parameter is "passed by reference", so any changes made to that variable within the function will be applied to the variable passed to it within the calling scope:[code=php]
function foo($var) // normal pass by copy
{
$var = $var * 2;
}
function bar(&$var) // pass by reference
{
$var = $var * 2;
}
$test = 3;
foo($test);
echo $test; // "3" -- no change in this scope
bar($test);
echo $test; // "6" -- change applied in this scope as well
[/code]0
@NogDogMar 13.2011 — #Without understanding the bigger picture, I'm hesitant to say that's the "best" solution. It has the "smell" of coupling the class too closely to the application code. What if you want to re-use the class in a situation where you do not want it to increment the supplied argument? Why should the class care whether or not the client code's variable is incremented automatically? Therefore, under the concept of separation of responsibility, for this simple case I would probably favor returning the incremented value, and then letting the calling code decide whether or not to apply it to the argument by using that returned value.[code=php]
class Foo
{
public function bar($var)
{
return ++$var;
}
}
[/code]Calling code:
[code=php]
$foo = new Foo();
$var = 1;
$var = $foo->bar($var);
// or if you don't want $var itself to change:
$var_2 = $foo->($var);
[/code]