string sql_regcase (string string)
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.
Following is the piece of code, copy and paste this code into a file and verify the result.
<?php $version = "php 4.0"; print sql_regcase($version); ?>
This will produce the following result −