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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 |
|---|---|
| 738 | * The dynamic portion of the hook, `$meta_type`, refers to the meta object type |
| 739 | * (post, comment, term, user, or any other type with an associated meta table). |
| 740 | * Returning a non-null value will effectively short-circuit the function. |
| 741 | * |
| 742 | * @since 5.0.0 |
| 743 | * |
| 744 | * @param stdClass|null $value The value to return. |
| 745 | * @param int $meta_id Meta ID. |
| 746 | */ |
| 747 | $check = apply_filters( "get_{$meta_type}_metadata_by_mid", null, $meta_id ); |
| 748 | if ( null !== $check ) { |
| 749 | return $check; |
| 750 | } |
| 751 | |
| 752 | $id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id'; |
| 753 | |
| 754 | $meta = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table WHERE $id_column = %d", $meta_id ) ); |
| 755 | |
| 756 | if ( empty( $meta ) ) { |