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how form validation really works

I´m interested on know how form validation works (not how to use it)

I know that Form_validation.php contains run() function but it's a little confused for me

Supose you want to validate this

$this->form_validation->set_rules('email', 'Email', 'required|valid_email');

I want to know how Form_validation.php validates the rules (like 'required|valid_email', etc)


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