doflamingo doflamingo - 3 months ago 24
PHP Question

Codeigniter , PHP - form validation only letter in other langauge?

In Codeigniter 3
I use alpha to validate form for only letters

$this->form_validation->set_rules('firstname', 'FirstName', 'trim|required|alpha',
array('required' => 'please refill', 'alpha' => 'don't want integer')

but the problem is the Thai Language letter is not work T_T(it's work only for English letter). I have already put a meta charset utf-8 on head section, but it's not work too. How should I do?


As one of the solution you can use the regex_match rule and specify allowed characters. Or you can override the alpha rule and implement it with help of preg_match function. Check the Extending Native Libraries section of the CodeIgniter docs.

Also you can try to play with locales. The alpha rule is implemented using the ctype_alpha function. According to the docs, by default, it uses the standard C locale([A-Za-z]). You can try to change locale using the setlocale function.