Need to search a content which is in greek letters using strtoupper and strtolower

Question

Hi all,

I am currently working in a GREEK project. In that project all the contents are GREEK and in that i have a search functionality. Search process is good. But strtoupper() didn't convert the Greek language to upper case and strtolower() didn't convert the Greek language to lower case.

But for English language its working fine. Is there any possible way to convert the Greek letters to UPPER and LOWER case.

thanks

Fero

Answer 1

Use Mb_StrToUpper and Mb_StrToLower

They are a part of the Multibyte String Functions, that can work with multibyte character encodings.

Answer 2

Use mb_strtoupper() and mb_strtolower().

Answer 3

How about trying these functions:

mb_strtoupper
mb_strtolower

Answer 4

$str = 'παπακωνσταντινου';

$test = mb_convert_case($str, MB_CASE_UPPER, "UTF-8");

This is the correct syntax.

thanks all guys

Answer 5

There is no reason mb_strtolower() and mb_strtoupper() shouldn't work:

<?php

header('Content-Type: text/html; charset=utf-8');

echo mb_strtoupper('παπακωνσταντινου', 'UTF-8'); // ΠΑΠΑΚΩΝΣΤΑΝΤΙΝΟΥ
echo mb_strtolower('ΠΑΠΑΚΩΝΣΤΑΝΤΙΝΟΥ', 'UTF-8'); // παπακωνσταντινου

?>

Using mb_convert_case() is another option, specially if you want to mimic ucwords():

<?php

header('Content-Type: text/html; charset=utf-8');

echo mb_convert_case('παπακωνσταντινου', MB_CASE_UPPER, 'UTF-8'); // ΠΑΠΑΚΩΝΣΤΑΝΤΙΝΟΥ
echo mb_convert_case('ΠΑΠΑΚΩΝΣΤΑΝΤΙΝΟΥ', MB_CASE_LOWER, 'UTF-8'); // παπακωνσταντινου
echo mb_convert_case('παπακωνσταντινου', MB_CASE_TITLE, 'UTF-8'); // Παπακωνσταντινου

?>