A range of examples of using Rollbar PHP is available here: Rollbar PHP Examples.
A Wordpress Plugin is available through Wordpress Admin Panel or through Wordpress Plugin directory: Rollbar Wordpress
A Laravel-specific package is available for integrating with Laravel: Rollbar Laravel
A CakePHP-specific package is avaliable for integrating with CakePHP 2.x: CakeRollbar
A Flow-specific package is available for integrating with Neos Flow: m12/flow-rollbar
Yii package: baibaratsky/yii-rollbar
Yii2 package: baibaratsky/yii2-rollbar