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

echo preg_match('~^\p{Lu}~u', $string_data) ? 'Upper' : 'lower';

/** Please check below lines. I have elaborate above code. **/

~      ; start pattern delimiter 
^      ; match from the start of the input string
\p{Lu} ; match exactly one uppercase letter (Unicode safe)
~      ; ending pattern delimiter 
u      ; enable unicode match