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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 |
---|---|
504 | } |
505 |
|
506 | /** |
507 | * {@internal Missing Short Description}} |
508 | * |
509 | * @since 1.2.0 |
510 | */ |
511 | function meta_form() { |
512 | global $wpdb; |
513 | $limit = (int) apply_filters( 'postmeta_form_limit', 30 ); |
514 | $keys = $wpdb->get_col( " |
515 | SELECT meta_key |
516 | FROM $wpdb->postmeta |
517 | GROUP BY meta_key |
518 | HAVING meta_key NOT LIKE '\_%' |
519 | ORDER BY meta_key |
520 | LIMIT $limit" ); |
521 | if ( $keys ) |
522 | natcasesort($keys); |