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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 |
---|---|
2518 | } |
2519 |
|
2520 | /** |
2521 | * {@internal Missing Short Description}} |
2522 | * |
2523 | * @since unknown |
2524 | */ |
2525 | function meta_form() { |
2526 | global $wpdb; |
2527 | $limit = (int) apply_filters( 'postmeta_form_limit', 30 ); |
2528 | $keys = $wpdb->get_col( " |
2529 | SELECT meta_key |
2530 | FROM $wpdb->postmeta |
2531 | GROUP BY meta_key |
2532 | HAVING meta_key NOT LIKE '\_%' |
2533 | ORDER BY LOWER(meta_key) |
2534 | LIMIT $limit" ); |
2535 | if ( $keys ) |
2536 | natcasesort($keys); |