..not an internals question me thinks ... redirecting to generals mailing list
mike schreef:
> I am trying to figure out a strategy for multiple output formats on a
> site, and it seems like I can have functions defined by default, but
> have them defined -after- I've included the targetted format first.
>
> However that would require
>
> file1.php:
>
> function foo() {}
>
> file2.php
>
> if(!function_exists('foo')) {
> function foo() {}
> }
>
> Is this a very expensive thing to do? There would be a good number of
> functions that would be leveraging this. Is it a no-no? or is it
> pretty cheap?
it busts opcode caches. so I wouldn't recommend it at all,
don't do conditional includes or function/class definitions if you
can help it.
idea: use some kind of registry pattern to register outputters,
the the code requiring an outputter can request it from the register.
1. I would think about using a class for each outputter (instead of
a function) ... chances are you will have need for more than just 'foo'
2. register all the default outputters
3. register some optional, overriding outputters dependent on the context.
<?php
abstract class OutputRegistry
{
private $objs;
static function register($key, $obj) {
self::$objs[$key] = $obj;
}
static function get($key) {
return self::$objs[$key];
}
}
// default
OutputRegistry::register('renderer', new HTMLRenderer);
// overriding (in some other file) to allow creating JSON output
OutputRegistry::register('renderer', new JSONRenderer);
>
> Thanks
> - mike
>
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