PHP Bugs: Undefined Indexes and Loose Types

PHP Notice:  Undefined index: reciept_email in /opt/cottenio/core.php on line 331

There are many errors in PHP that are like siblings: undefined variable, undefined property, and undefined index for instance — and they all range in severity based on circumstance. Some are like the quiet wallflowers at the school dance nobody notices, while others are deadly killers just waiting to ambush…