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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 |
|---|---|
| 593 | |
| 594 | /** |
| 595 | * Filter the number of custom fields to retrieve for the drop-down |
| 596 | * in the Custom Fields meta box. |
| 597 | * |
| 598 | * @since 2.1.0 |
| 599 | * |
| 600 | * @param int $limit Number of custom fields to retrieve. Default 30. |
| 601 | */ |
| 602 | $limit = (int) apply_filters( 'postmeta_form_limit', 30 ); |
| 603 | $keys = $wpdb->get_col( " |
| 604 | SELECT meta_key |
| 605 | FROM $wpdb->postmeta |
| 606 | GROUP BY meta_key |
| 607 | HAVING meta_key NOT LIKE '\_%' |
| 608 | ORDER BY meta_key |
| 609 | LIMIT $limit" ); |
| 610 | if ( $keys ) { |
| 611 | natcasesort( $keys ); |