Magento service provider to handle PHP errors, dump variables, execute PHP code remotely in Google Chrome https://chrome.google.com/webstore/detail/php-console/nfhmhhlpfleoednkpnnnkolmclajemef

Download files and extract to magento directory https://github.com/mkutyba/magento-php-console/archive/master.zip

or

Install using modman

or

Install using composer

How to install a Magento module: http://fbrnc.net/blog/2014/11/how-to-install-a-magento-module