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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 |
|---|---|
| 2322 | } |
| 2323 | |
| 2324 | /** |
| 2325 | * {@internal Missing Short Description}} |
| 2326 | * |
| 2327 | * @since unknown |
| 2328 | */ |
| 2329 | function meta_form() { |
| 2330 | global $wpdb; |
| 2331 | $limit = (int) apply_filters( 'postmeta_form_limit', 30 ); |
| 2332 | $keys = $wpdb->get_col( " |
| 2333 | SELECT meta_key |
| 2334 | FROM $wpdb->postmeta |
| 2335 | WHERE meta_key NOT LIKE '\_%' |
| 2336 | GROUP BY meta_key |
| 2337 | ORDER BY meta_id DESC |
| 2338 | LIMIT $limit" ); |
| 2339 | if ( $keys ) |
| 2340 | natcasesort($keys); |