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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 |
|---|---|
| 145 | * - `added_user_meta` |
| 146 | * |
| 147 | * @since 2.9.0 |
| 148 | * |
| 149 | * @param int $mid The meta ID after successful update. |
| 150 | * @param int $object_id ID of the object metadata is for. |
| 151 | * @param string $meta_key Metadata key. |
| 152 | * @param mixed $_meta_value Metadata value. |
| 153 | */ |
| 154 | do_action( "added_{$meta_type}_meta", $mid, $object_id, $meta_key, $_meta_value ); |
| 155 | |
| 156 | return $mid; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Updates metadata for the specified object. If no value already exists for the specified object |
| 161 | * ID and metadata key, the metadata will be added. |
| 162 | * |
| 163 | * @since 2.9.0 |