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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 |
|---|---|
| 124 | * (post, comment, term, user, or any other type with an associated meta table). |
| 125 | * |
| 126 | * @since 2.9.0 |
| 127 | * |
| 128 | * @param int $mid The meta ID after successful update. |
| 129 | * @param int $object_id ID of the object metadata is for. |
| 130 | * @param string $meta_key Metadata key. |
| 131 | * @param mixed $_meta_value Metadata value. Serialized if non-scalar. |
| 132 | */ |
| 133 | do_action( "added_{$meta_type}_meta", $mid, $object_id, $meta_key, $_meta_value ); |
| 134 | |
| 135 | return $mid; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Updates metadata for the specified object. If no value already exists for the specified object |
| 140 | * ID and metadata key, the metadata will be added. |
| 141 | * |
| 142 | * @since 2.9.0 |