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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 |
|---|---|
| 971 | FROM $wpdb->postmeta |
| 972 | GROUP BY meta_key |
| 973 | ORDER BY meta_key" ); |
| 974 | |
| 975 | return $keys; |
| 976 | } |
| 977 | |
| 978 | function meta_form() { |
| 979 | global $wpdb; |
| 980 | $limit = (int) apply_filters( 'postmeta_form_limit', 30 ); |
| 981 | $keys = $wpdb->get_col( " |
| 982 | SELECT meta_key |
| 983 | FROM $wpdb->postmeta |
| 984 | GROUP BY meta_key |
| 985 | ORDER BY meta_id DESC |
| 986 | LIMIT $limit" ); |
| 987 | if ( $keys ) |
| 988 | natcasesort($keys); |
| 989 | ?> |