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<?php
function update_post_meta($post_id, $meta_key, $meta_value, $prev_value = '') {
    // make sure meta is added to the post, not a revision
    if ( $the_post = wp_is_post_revision($post_id) )
        $post_id = $the_post;

    return update_metadata('post', $post_id, $meta_key, $meta_value, $prev_value);
}
?>

• Function Reference/update post meta « WordPress Codex
  The function, update_post_meta(), updates the value of an existing meta key ... ( has with suffix _ci) then update_post_meta and delete_post_meta and get_posts ...
  codex.wordpress.org
• post meta - How to hook update_post_meta and delete_post_meta ...
  May 10, 2011 ... If update_post_meta is fired then check to see if the meta_key is equal to something (I want to trigger some code if a particular meta_key is ...
  wordpress.stackexchange.com
• update_post_meta for Custom Post Type in Wordpress doesn't work ...
  You have 'global $post;' outside of the save_specifiche_tetti function, so your update_post_meta has no access to the ID ...
  stackoverflow.com
• update_post_meta | Pippins Plugins
  Apr 23, 2012 ... In the Jobs Posting with Easy Content Types and Gravity Forms tutorial, we used Gravity Forms to create a submission form for users to post ...
  pippinsplugins.com

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