<?php
$words = [
'bailey', 'boffey', 'böhm', 'brown', 'серге́й', 'сергий', 'swag', 'svere'
];
$collator = new Collator( 'sv@collation=default' );
foreach ( $words as $word )
{
$sortKey = $collator->getSortKey( $word );
printf("%-26s: %-12s\n", bin2hex( $sortKey ), $word );
}
?>