How can I detect non-western characters?

Question

I want to disallow certain UTF-8 input (server-side), e.g. eastern languages, where example input might be \" 伊 \".

However, I do want to continue supporting other l

Answer 1

Just do

preg_match('/[^\\p{Common}\\p{Latin}]/u', $string)

where $string is an UTF-8 string. This will return "1" if there are non-latin characters and will return "0" otherwise.

Example:

var_dump(preg_match('/[^\\p{Common}\\p{Latin}]/u', 'sf..ŷaás??'));  //int(0)
var_dump(preg_match('/[^\\p{Common}\\p{Latin}]/u', 'sf..ŷݤaás??')); //int(1)