- strtolower: documentation ( source)
<?php
$name='tAtIaNa';
switch(strtolower($name)) {
case 'tat'.'ia'.'na':
echo 'tat';
case 'angela':
echo 'ang';
case array(1):
echo 'Arr';
case 'bard':
echo 'bar';
break;
default:
echo 'sonia';
}