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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 |
|---|---|
| 619 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 620 | * object type (comment, post, term, or user). Returning a non-null value |
| 621 | * will effectively short-circuit the function. |
| 622 | * |
| 623 | * @since 5.0.0 |
| 624 | * |
| 625 | * @param mixed $value The value get_metadata_by_mid() should return. |
| 626 | * @param int $meta_id Meta ID. |
| 627 | */ |
| 628 | $check = apply_filters( "get_{$meta_type}_metadata_by_mid", null, $meta_id ); |
| 629 | if ( null !== $check ) { |
| 630 | return $check; |
| 631 | } |
| 632 | |
| 633 | $meta = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table WHERE $id_column = %d", $meta_id ) ); |
| 634 | |
| 635 | if ( empty( $meta ) ) { |
| 636 | return false; |
| 637 | } |