NetTuts.com continues their series covering development with the Yii2 framework today with a new post looking at specialized validations (expanding on their previous post covering some of the basic built-in validations).

In this Programming With Yii2 series, I'm guiding readers in use of the newly upgraded Yii2 Framework for PHP. This tutorial is our second part, looking at Yii2's validators. Validators simplify the code needed to validate input, i.e. verify conformance or non-conformance of data input, typically from users via web forms. Specifically, we're going to explore some of the built-in specialty validations that are common to web development.

They cover some of the more complex validators in this tutorial including:

• CaptchaValidator
• ExistValidator
• ImageValidator
• RegularExpressionValidator
• UniqueValidator
• UrlValidator

They cover each of them with a brief summary of what they can do and a code example showing them in action. In some cases (like with the CAPTCHA validator) a screenshot is also included of the output.