On Jan 23, 2008 8:02 AM, Eric Butera <eric.butera@xxxxxxxxx> wrote:
> Maybe someday SPL will become part of the PHP manual too. ;)
>
ill admit, the doxygen documentation is a little daunting at first. at
least
more so than phpDocumentor for example. but once youve cruised around
the spl docs for a little while, you can see its truly amazing. marcus has
done a superb job with it!
and, ive made a discovery. im sure this is novice level, for people who
actually
have a clue what they are doing w/ spl, which unfortunately seems like next
to
no one. well, im getting to know it; anyway, i digress.
DualIterator is not 'in' php, because well, its not written in c. marcus
has distributed
several classes and procedural files along with the c code to round out the
spl
extension. the example code is included in the php source, so in order to
use it
youll have to download the source and unpack it. you will find the example
code
beneath
ext/spl/examples
in particular, the DualIterator class is in the
dualiterator.inc
file. and now, for my last trick, an example of the DualIterator, to
illustrate how simple
it is, (and incidentally less error prone than rolling your own, since its
been tested).
<?php
require('dualiterator.inc');
$leftSideArray = array('one' => 1, 'two' => 2, 'three' => 3, 'four' => 4);
$rightSideArray = array('one' => 'a', 'two' => 'b', 'three' => 'c', 'four'
=> 'd');
$di = new DualIterator(new ArrayIterator($leftSideArray), new
ArrayIterator($rightSideArray));
while($di->valid()) {
var_dump($di->key());
var_dump($di->current());
$di->next();
}
?>
to test whether the arrays have the same number of keys and values; in this
example all we
would have to do is:
$di->areEqual();
-nathan
