how to increase custom post value by one most efficiently?

Enter WP_Post and the “magic” getter – did you know…

$value = get_post_meta( $post->ID, 'custom_field', true );

…is the same as

$value = $post->custom_field;

So you can shorten your code to:

update_post_meta( $post->ID, 'custom_field', $post->custom_field + 1 );

Note you cannot do $post->custom_field++ – since the property doesn’t actually exist, it can’t be modified. Read more about overloading in PHP.

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