How Can I save multiple records in same meta key?

Question

I want to save multiple dates in meta key.

I have a three dates 2,3,4 and I want to save all these values in same meta key but as a different values.

For example:

dates(meta key) 2(meta value)
dates(meta key) 3(meta value)
dates(meta key) 4(meta value)

Answer 1

This should work out of the box, as long as the "unique" parameter of add_post_meta() is false.

add_post_meta($id, '_dates', 2, false);
add_post_meta($id, '_dates', 3, false);
add_post_meta($id, '_dates', 4, false);

then somewhere else

$dates = get_post_meta($id, '_dates', false);

Now $dates should be an array of your 3 values.