This library provides an interface to rank object. Included you can find classes PHP Ranking system for MySQL tables.

To rank a mysql row, the best way is to provide a score for it and let the algorithm rank the row based on that score. Though, sometimes it is not possible to have a score row, e.g when you have a lot of different groups of rows to rank and score can be different based on the group selected. At the current version, a score column defined is mandatory. Moreover, defining and using a rank column gives the best performance, but this is not required.

Different ranks can exist for an object based on conditions and different scores can exist for each group. The best way to implement this is to create a different ranking class that implements the AlgorithmInterface for each group.

Mysql table users( varchar name, int score, int rank, int group_rank )

1. Rank rows by score.

$simple_ranking = new SimpleRanking($mysqli, 'users, 'score', 'rank');

if (!$simple_ranking->isReady()) {
    $simple_ranking->run();
}

$object = new Object($ranking_obj);

$object->setAttributes(array('name' => 'Bob));

$rank = $object->getRank();

$score = $object->getScore();
    `

2. Rank a group of rows by score.

$advanced_ranking = new AdvancedRanking($mysqli, 'users, 'score', 'group_rank');

// select only names that contain "s".
$advanced_ranking->excludeByColumn('name', $condition, 'LIKE');
$advanced_ranking->addAltOrderByColumn('name', 'DESC');

if (!$advanced_ranking->isReady()) {
    $advanced_ranking->run();
}`