Peruse all of PHP's new features since you released last version

[deni-zen]

The last time I released any version of any PHP library code was pre-PHP5.3. There have been a TON of features added to PHP since then. Some of which I have barely even had occasion to learn and use yet. Take a look at the new features and play around with them. See what you can use that genuinely improves the library in some way (definitely don't use new features just because they're shiny and new... I've made that mistake in the past).

Here is a great place to start, as far as finding and playing with all the new features: http://php.net/manual/en/appendices.php

And here are a few features I can think of off the top of my head that I would definitely like to find the time to play around with when I get the time:

• Data Structures - I have never used any of these... they are worth at least checking out...
• Goto (I would only use this to break out of loops and such) (PHP5.3)
• Late static bindings (PHP5.3)
• __invoke() magic method added (PHP5.3)
• Traits (PHP5.4)
• Class::{expr}() syntax (PHP5.4)
• Better fluid method support with (new Foo)->bar() syntax (PHP5.4)
• Function array dereferencing and short array syntax (PHP5.4)
• Generators (PHP5.5)
• foreach now supports "list" (PHP5.5)
• sexier syntax for variadic functions and argument unpacking (PHP5.6)

[deni-zen]

I remember reading on one of those "new features for PHP5.x" pages that iterators can now support different types for keys when iterating. See if you could do something like this:

foreach ($reader as $line_no => $row) {
    foreach ($row as $column => $data) {
        echo "Row is: " . $row->getLabel() . "\n";
        echo "Column is: " . $column->getLabel() . "\n";
    }
}

The key() method for the inner iterator would return a column object. Try it.