(PHP 5 >= 5.3.0, PECL intl >= 1.0.0)
Collator::setAttribute -- collator_set_attribute — Set collation attribute
Object oriented style
$attr
   , int $val
   )Procedural style
   Returns TRUE on success or FALSE on failure.
  
Example #1 collator_set_attribute() example
<?php
$coll = collator_create( 'en_CA' );
$val  = collator_get_attribute( $coll, Collator::NUMERIC_COLLATION );
if ($val === false) {
    // Handle error.
} elseif ($val === Collator::ON) {
    // Do something useful.
}
?>