Thomas Angst wrote:
Hello List,
I would like to create an object inside a function with its classname
and a parameter list submitted by the function call.
function create($class, $parameter) {
$obj = new $class($parameter);
return $obj;
}
This is working very well. But I have not every time the same count of
parameters for a class constructor.
If this is a normal method call of an object I can realise it like this:
$ret = call_user_func_array(array(&$obj, 'method'), $parameter_array);
The $parameter_array contains as many entries as the function needs.
Works well too.
But how can I write a function to instance objects with various count of
parameters in the constructor?
I know, can do this with an eval. But I would like to find a solution
where I don't need an eval.
to keep it easy have your ctors be able to except an assoc array as the first
argument as an alternative to its normal arg list - or just use an assoc array
period - that combined with a call to expand() in the ctor.
then... something like:
function create($class, $params)
{
if (!class_exists($class)) {
return null;
}
return new $class( $params );
}
<TAKE_NOTE>
btw if your on php4 your probably what to be using lots of f'ing '&' signs.
</TAKE_NOTE>
alternatively it's either:
1. use eval() - yuck
2. make all your objects have empty ctors and force them to have an _init()
method that actually does the work e.g.
function create($class)
{
if (!class_exists($class)) {
return null;
}
$params = func_get_args();
$params = array_slice($params, 1);
$o = new $class();
call_user_func_array(array($o, '_init'), $params);
return $o;
}
3. re-evaluate what you are trying to achieve with the create function.
maybe you need a factory base class instead? (for instance)
thanks for all answers,
Thomas
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