WordPress uses maybe_serialize() and maybe_unserialize(). Both of them use PHP’s native serialize() and unserialize() functions. See:
http://phpxref.ftwr.co.uk/wordpress/wp-includes/functions.php.source.html#l1028
http://phpxref.ftwr.co.uk/wordpress/wp-includes/functions.php.source.html#l222
Both of those functions make use of the function is_serialized(), which checks if the variable is serialized yet. See:
http://phpxref.ftwr.co.uk/wordpress/wp-includes/functions.php.source.html#l222
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