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FYI on blank validation error_string

It took me a little bit to look this up in the code after I didn't find anything in the forum so I thought I would add this...

If your form_validation is invalid but you aren't getting any error data back (e.g. $this->form_validation->error_string() or validation_errors() is empty) it is most likely because no data is being sent through POST. If $_POST is blank form_validation->run will return FALSE and not run any validation rules.

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