PHP - 单独的大写和小写字符

Question

I want to separate upper or lower case characters.

In this text : "HELLO WORLD how are you"

I want to have in the first variable : "HELLO WORLD" and "how are you" in the second.

How can I do that with php ?

Thanks a lot

Answer 1

Just to use a different, non-regexp approach

$original = "HELLO WORLD how are you";

$upper = trim(implode(array_intersect(str_split($original),str_split(strtoupper($original)))));
$lower = trim(implode(array_intersect(str_split($original),str_split(strtolower($original)))));

echo $upper,'<br />';
echo $lower,'<br />';