serialize a javascript associative array

[sde]

i need to serialize an associative array in javascript to send in a single form field to PHP.

i've found random scripts, but when i unserialize() in php, it doesn't return anything.

any ideas?

[sde]

that is an example of what won't serialize.

a:3:{s:1:"1";a:2:{s:12:"content_type";s:4:"blog";s:14:"selected_nodes";a:1:{s:1:"0";i:23;}}}