How to get current language id

[tips007]

i want to show the current language id in main page,
for example, if switch to language english, show the id "1",

i tried this, but it doesn't work
<?php echo $current_language_id; ?>

any idea?

[DrByte]

$_SESSION['language'] will give 'english'
$_SESSION['languages_id'] will give '1'
$_SESSION['languages_code'] will give 'en'

[tips007]

thank you