As I can see, this problem has not been properly solved. I think I went through all the suggested solutions, but it was based on patching a specific problem. Which clearly, in my opinion, indicates a lack of PHP support for a correct solution to the basic, nastiest situation. It’s about correct sorting (ascending or descending) for an array containing lowercase and uppercase letters and specific national characters. The solution below, which I am currently using, sorts lowercase and uppercase letters correctly but throws out national characters at the very end. None of you would like it. Array_multisort, mb_strcasecmp and collate are not working properly.
(pl-PL)
f.eg.
balkon
Bażant
goleń
Gęś
Koza
kuchnia
mąka
mięso
Struś
Wiewiórka
Zając
Łopian
Świnia
usort($file_info_all, function ($a, $b) {
return strcasecmp($a['file_info_01c_text'], $b['file_info_01c_text']);
});
correct
balkon
Bażant
Gęś
goleń
Koza
kuchnia
Łopian
mąka
mięso
Struś
Świnia
Wiewiórka
Zając
alphabet:
a ą Ą b c ć Ć d e ę Ę f g h i j k l ł Ł m n ń Ń o ó Ó p r s ś Ś t u v x y z ż Ż ź Ź