Sort list of page templates a-z?

by

You can use ksort() function to sort the array of $templates = get_page_templates();. So the full code will be-

<?php
$templates = get_page_templates();
// Sort based on key
ksort($templates);
foreach ( $templates as $template_name => $template_filename ) {
    echo "$template_name ($template_filename)<br />";
}
?>

Also see asort() if you need.