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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 |
|---|---|
| 815 | * - `get_comment_metadata_by_mid` |
| 816 | * - `get_term_metadata_by_mid` |
| 817 | * - `get_user_metadata_by_mid` |
| 818 | * |
| 819 | * @since 5.0.0 |
| 820 | * |
| 821 | * @param stdClass|null $value The value to return. |
| 822 | * @param int $meta_id Meta ID. |
| 823 | */ |
| 824 | $check = apply_filters( "get_{$meta_type}_metadata_by_mid", null, $meta_id ); |
| 825 | if ( null !== $check ) { |
| 826 | return $check; |
| 827 | } |
| 828 | |
| 829 | $id_column = ( 'user' === $meta_type ) ? 'umeta_id' : 'meta_id'; |
| 830 | |
| 831 | $meta = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $table WHERE $id_column = %d", $meta_id ) ); |
| 832 | |
| 833 | if ( empty( $meta ) ) { |