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<?php
function delete_post_meta_by_key($post_meta_key) {
    return delete_metadata( 'post', null, $post_meta_key, '', true );
}
?>

• delete_post_meta_by_key | A HitchHackers guide through WordPress
  Feb 11, 2011 ... Source code. function delete_post_meta_by_key($post_meta_key) { return delete_metadata( 'post', null, $post_meta_key, '', true ); }. 808 ...
  hitchhackerguide.com
• post.php
  Jul 16, 2009 ... delete_post_meta_by_key(), Delete everything from post meta matching meta key. get_all_page_ids(), Get a list of page IDs. get_attached_file() ...
  www.tig12.net
• #18196 (Post Meta API Cleanup) – WordPress Trac
  delete_meta() , get_post_meta_by_id(), has_meta(), update_meta(), delete_post_meta_by_key() should be wrappers around the metadata API. The metadata ...
  core.trac.wordpress.org
• #18823 (Pass $post_id as second argument to delete_postmeta ...
  I think that the extra values weren't passed for delete_postmeta as this action is used in two different circumstances. delete_meta and delete_post_meta_by_key ...
  core.trac.wordpress.org

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