WordPress Codesnippets

add post meta


value, $unique );

If you want to save post meta data when a post is saved, you need to register a callback function using the save_post action hook:
add_action( 'save_post', 'my_custom_post_meta' );

So the code you posted simply defines a function my_custom_post_meta() which uses add_post_meta() to add post meta data, and it registers that function as a callback for the save_post action hook.

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