Ron Korving wrote:
Named parameter example:
Your example misses the main advantage of named parameters IMHO: Sets of
parameters you don't want to or can't explicitely list because they are
not know yet.
function adduser($params)
{
if (!is_array($params)) throw new Exception('No named parameters');
if (!isset($params['username'])) throw new Exception('Missing parameter:
username');
if (!isset($params['password'])) throw new Exception('Missing parameter:
username');
if (!isset($params['superuser'])) $params['superuser'] = false;
// now do some stuff with $params
}
adduser(array('username' => 'root', 'password' => 'abcdefg', 'superuser'
=> true));
This is not how we use named parameters at all. If you have a finite set
of fixed parameters then positional parameters are working just fine.
One of the main advantages lies in a catch-all parameter which gets all
unassignable parameters. While this opens the door for typos even a
whips'n'chains language like Python added this feature because it is
just too useful to omit if you have named parameters :-)
Our use case is something along the lines of (not the actual code, so
don't comment on anything specific here ;-)):
function tag($name, $p = array())
{
foreach ($p as $key => $value)
{
if (is_int($key))
$content .= $value;
else
$attributes .= " $key='$value'";
}
return "<$name$attributes>$content</$name>";
}
function a($p = array())
{
return tag("a", $p);
}
...
echo a(array('href' => $url, 'title' => $title));
or with our patch to make array() obsolete
echo a('href' => $url, 'title' => $title);
Now something like
echo a(href: $url, title: $title, 'non-identifier-chars': 42);
would be even neater, agreed ;-)
- Chris
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