Comparing strings:

<?php
$coll 
= new Collator("fr_CA");
if (
$coll->compare("côte""coté") < 0) {
    echo 
"less\n";
} else {
    echo 
"greater\n";
}
?>
Output
less

Ignore case and accents:

<?php
$coll 
= new Collator("fr_CA");
$coll->setStrength(Collator::PRIMARY);
if (
$coll->compare("côte""cOTé") == 0) {
    echo 
"same\n";
} else {
    echo 
"different\n";
}
?>
Output
same