(PHP 5 >= 5.3.0, PECL enchant >= 0.1.0 )
enchant_broker_dict_exists — Whether a dictionary exists or not. Using non-empty tag
$broker
   , string $tag
   )Tells if a dictionary exists or not, using a non-empty tags
brokerBroker resource
tagnon-empty tag in the LOCALE format, ex: us_US, ch_DE, etc.
   Returns TRUE when the tag exist or FALSE when not.
  
Example #1 A enchant_broker_dict_exists() example
<?php
$tag = 'en_US';
$r = enchant_broker_init();
if (enchant_broker_dict_exists($r,$tag)) {
    echo $tag . " dictionary found.\n";
}
?>