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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 |
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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 ); |