Calculate text diffs in PHP

What sort of diffs? File diffs? There is array_diff() which acts on arrays. Then there is also xdiff, which "enables you to create and apply patch files containing differences between different revisions of files.". The latter acts on files or strings.

Edit: I should add xdiff doesn't appear to be out in a release yet. You have to build from source to use it.

Here's a nice little function that will add up any number of times passed in an array:-

function addTimes(Array $times)
{
    $total = 0;
    foreach($times as $time){
        list($hours, $minutes, $seconds) = explode(':', $time);
        $hour = (int)$hours + ((int)$minutes/60) + ((int)$seconds/3600);
        $total += $hour;
    }
    $h = floor($total);
    $total -= $h;
    $m = floor($total * 60);
    $total -= $m/60;
    $s = floor($total * 3600);
    return "$h:$m:$s";
}

Use it like this:-

$times = array('12:39:25', '08:22:10', '11:08:50', '07:33:05',);
var_dump(addTimes($times));

Output:-

string '39:43:30' (length=8)

Never used any of those, but they look interesting..

Take a look at Gearman as well.. more overhead in systems like these but you get other cool stuff :) Guess it depends on your needs ..