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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 |
|---|---|
| 550 | * Prints the form in the Custom Fields meta box. |
| 551 | * |
| 552 | * @since 1.2.0 |
| 553 | * |
| 554 | * @param WP_Post $post Optional. The post being edited. |
| 555 | */ |
| 556 | function meta_form( $post = null ) { |
| 557 | global $wpdb; |
| 558 | $post = get_post( $post ); |
| 559 | $limit = (int) apply_filters( 'postmeta_form_limit', 30 ); |
| 560 | $keys = $wpdb->get_col( " |
| 561 | SELECT meta_key |
| 562 | FROM $wpdb->postmeta |
| 563 | GROUP BY meta_key |
| 564 | HAVING meta_key NOT LIKE '\_%' |
| 565 | ORDER BY meta_key |
| 566 | LIMIT $limit" ); |
| 567 | if ( $keys ) |
| 568 | natcasesort($keys); |