When debugging code I always want to force PHP to display all the errors, including any warnings so I can make sure my code isn’t doing anything unexpected. Its something I do so often that I should know the two lines of code off the top of my head. If I really thought about it I probably do but sadly Google + Copy / Paste is actually quicker than typing it out. So as much for my own benefit as anyone elses, here are the two lines of code I use over and over:
error_reporting(E_ALL);
ini_set('display_errors', '1');