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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 |
|---|---|
| 113 | * object type (comment, post, or user). |
| 114 | * |
| 115 | * @since 2.9.0 |
| 116 | * |
| 117 | * @param int $mid The meta ID after successful update. |
| 118 | * @param int $object_id Object ID. |
| 119 | * @param string $meta_key Meta key. |
| 120 | * @param mixed $meta_value Meta value. |
| 121 | */ |
| 122 | do_action( "added_{$meta_type}_meta", $mid, $object_id, $meta_key, $_meta_value ); |
| 123 | |
| 124 | return $mid; |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Update metadata for the specified object. If no value already exists for the specified object |
| 129 | * ID and metadata key, the metadata will be added. |
| 130 | * |
| 131 | * @since 2.9.0 |