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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 |
|---|---|
| 514 | } |
| 515 | |
| 516 | /** |
| 517 | * {@internal Missing Short Description}} |
| 518 | * |
| 519 | * @since 1.2.0 |
| 520 | */ |
| 521 | function meta_form() { |
| 522 | global $wpdb; |
| 523 | $limit = (int) apply_filters( 'postmeta_form_limit', 30 ); |
| 524 | $keys = $wpdb->get_col( " |
| 525 | SELECT meta_key |
| 526 | FROM $wpdb->postmeta |
| 527 | GROUP BY meta_key |
| 528 | HAVING meta_key NOT LIKE '\_%' |
| 529 | ORDER BY meta_key |
| 530 | LIMIT $limit" ); |
| 531 | if ( $keys ) |
| 532 | natcasesort($keys); |