Copyright © 2014 by tutorialspoint
The sql_regcase() function can be thought of as a utility function, converting each character in the input parameter string into a bracketed expression containing two characters.
If the alphabetical character has both an uppercase and a lowercase format, the bracket will contain both forms; otherwise the original character will be repeated twice.
Returns a string of bracketed expression alongwith convered character.
Following is the piece of code, copy and paste this code into a file and verify the result.
$version = "php 4.0";
This will produce following result:
[Pp] [Hh] [Pp] [ ]  [..]