Switch character case, php

Question

How can I swap around / toggle the case of the characters in a string, for example:

$str = \"Hello, My Name is Tom\";

After I run the code

Answer 1

I know this question is old - but here's my 2 flavours of a multi-byte implementation.

Multi function version: (mb_str_split function found here):

function mb_str_split( $string ) { 
   # Split at all position not after the start: ^ 
   # and not before the end: $ 
   return preg_split('/(? $character) {
       if(mb_is_upper($character))
           $character = mb_strtolower($character, 'UTF-8');
       else
           $character = mb_strtoupper($character, 'UTF-8');

       $characters[$key] = $character;
   }
   return implode('',$characters);
}

Single function version:

function mb_flip_case($string) {
    $characters = preg_split('/(? $character) {
        if(mb_strtolower($character, "UTF-8") != $character)
            $character = mb_strtolower($character, 'UTF-8');
        else
            $character = mb_strtoupper($character, 'UTF-8');

        $characters[$key] = $character;
    }
    return implode('',$characters);
}