Example function for checking the count value based on the key of $id in Redis against the value of $limit.

example_redis_api_limit_exceeded.php

<?php
function api_limit_exceeded($id='nobody', $limit=1500) {
	$redis = new Redis();
	$usage = 0;

	if($redis->connect($GLOBALS['REDIS_HOST'], $GLOBALS['REDIS_PORT'])) {
		if($redis->auth($GLOBALS['REDIS_PASSWORD'])) {
			$usage = $redis->get($id);
		} else {
			error_log('Error authenticating to redis!');
		}
	} else {
		error_log('Error connecting to redis!');
	}

	if($usage > $limit) {
		return true;
	} else {
		return false;
	}
}