How to check if letter is upper or lower in PHP?

Question

I have texts in UTF-8 with diacritic characters also, and would like to check if first letter of this text is upper case or lower case. How to do this?

Answer 1

I didn't want numbers and others to be an upper char, so I use:

if(preg_match('/[A-Z]$/',$char)==true)
{
   // this must be an upper char
   echo $char
}