Just put your files into an array and loop it.
$files = array('some-file.php', 'some-file2.php');
foreach ($files as $file) {
if ( @unlink ( $_SERVER[DOCUMENT_ROOT]."/".$file ) ) {
echo 'The file <strong><span style="color:green;">' . $file . '</span></strong> was deleted!<br />';
} else {
echo 'Couldn\'t delete the file <strong><span style="color:red;">' . $file . '</span></strong>!<br />';
}
}