Error with function in functions.php?

These two lines are wrong:

add_action('wp_ajax_get_data', mm_get_all_informations);
add_action('wp_ajax_nopriv_get_data', mm_get_all_informations);

You need to quote the function name:

add_action('wp_ajax_get_data', 'mm_get_all_informations');
add_action('wp_ajax_nopriv_get_data', 'mm_get_all_informations');

If you had debugging enabled, as you should when you are working, you would have spotted the problem immediately.

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