Ok, it is a little bit difficult to full understanding the unsafe validator.
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Wiki articles tagged with "Scenarios"
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Activate captcha after unsuccessful login attempts
Created 12 years ago by 
Kostas Apazidis (KonApaz),
updated 11 years ago by 
Rohit Suthar.
Kostas Apazidis (KonApaz),
updated 11 years ago by Rohit Suthar.
Like gmail, if you have tree or more unsuccessful login attemps a captcha appears
Understanding Scenarios
Luke JurgsScenarios are an extremely useful tool for separating validation tasks on any class you use derived from CModel. In this tutorial we will use CActiveRecord.