This tutorial explains how to convert strings to uppercase and lowercase using the strtolower and strtoupper functions. These functions each take one argument – the string that needs to be converted to lowercase or uppercase.
Example:
$uppercaseString = strtoupper($lowercaseString);
Watch the video below and then scroll down for the sample code.
PHP sample code:
<?php $mystring = "Hello world"; // convert to uppercase $mystring_upper = strtoupper($mystring); // convert to lowercase $mystring_lower = strtolower($mystring); echo $mystring , "</br>"; echo $mystring_upper , "</br>"; echo $mystring_lower; ?>