Validation
3 exercises work on this concept, by writing code in the browser.
In the tracks
- How many adventurers? Symfony for PHP developers · chapter 1: First steps at the tavern
- The specifications Symfony for PHP developers · chapter 12: The big night
In Practice
- Restricting an array's keys with array_keys A validation rule for “this array only contains these keys”: no more closure comparing array_keys() to a list.