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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1048 | FROM $wpdb->postmeta |
| 1049 | GROUP BY meta_key |
| 1050 | ORDER BY meta_key" ); |
| 1051 | |
| 1052 | return $keys; |
| 1053 | } |
| 1054 | |
| 1055 | function meta_form() { |
| 1056 | global $wpdb; |
| 1057 | $limit = (int) apply_filters( 'postmeta_form_limit', 30 ); |
| 1058 | $keys = $wpdb->get_col( " |
| 1059 | SELECT meta_key |
| 1060 | FROM $wpdb->postmeta |
| 1061 | GROUP BY meta_key |
| 1062 | ORDER BY meta_id DESC |
| 1063 | LIMIT $limit" ); |
| 1064 | if ( $keys ) |
| 1065 | natcasesort($keys); |
| 1066 | ?> |