Questions tagged [validation]

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Sanitize form input

I'm trying to sanitize form input values in my plugin. Yii2 framework provides the following validation method: https://www.yiiframework.com/doc/guide/2.0/en/tutorial-core-validators#filter It says ...
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Craft CMS User Registration Form Validation

I have enabled fron end registration form, I want to make firstName and lastName required in the form and also want to add custom fileds with required validation.