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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 |
|---|---|
| 106 | * - `add_term_meta` |
| 107 | * - `add_user_meta` |
| 108 | * |
| 109 | * @since 3.1.0 |
| 110 | * |
| 111 | * @param int $object_id ID of the object metadata is for. |
| 112 | * @param string $meta_key Metadata key. |
| 113 | * @param mixed $_meta_value Metadata value. |
| 114 | */ |
| 115 | do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value ); |
| 116 | |
| 117 | $result = $wpdb->insert( |
| 118 | $table, |
| 119 | array( |
| 120 | $column => $object_id, |
| 121 | 'meta_key' => $meta_key, |
| 122 | 'meta_value' => $meta_value, |
| 123 | ) |
| 124 | ); |