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<?php
function delete_post_meta($post_id, $meta_key, $meta_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 delete_metadata('post', $post_id, $meta_key, $meta_value);
}
?>

• Function Reference/delete post meta « WordPress Codex
  Description. This function deletes all custom fields with the specified key, or key and value, from the specified post. See also update_post_meta() ...
  codex.wordpress.org
• WordPress › Support » Tags — delete_post_meta
  WordPress › Support » delete_post_meta. Tag: delete_post_meta Add New » ... [ resolved] delete_post_meta problem for multiple meta entries using the same ...
  wordpress.org
• post meta - How to hook update_post_meta and delete_post_meta ...
  May 10, 2011 ... I need to hook into the delete_post_meta too that kind of does the reverse as above. Can anyone provide me with some example code for ...
  wordpress.stackexchange.com
• delete_post_meta() WordPress function reference, arguments and ...
  delete_post_meta(). Remove metadata matching criteria from a post. You can match based on the key, or key and value. Removing based on key and value, will ...
  queryposts.com

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