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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 |
|---|---|
| 92 | * The dynamic portion of the hook, `$meta_type`, refers to the meta object type |
| 93 | * (post, comment, term, user, or any other type with an associated meta table). |
| 94 | * |
| 95 | * @since 3.1.0 |
| 96 | * |
| 97 | * @param int $object_id ID of the object metadata is for. |
| 98 | * @param string $meta_key Metadata key. |
| 99 | * @param mixed $_meta_value Metadata value. Serialized if non-scalar. |
| 100 | */ |
| 101 | do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value ); |
| 102 | |
| 103 | $result = $wpdb->insert( |
| 104 | $table, |
| 105 | array( |
| 106 | $column => $object_id, |
| 107 | 'meta_key' => $meta_key, |
| 108 | 'meta_value' => $meta_value, |
| 109 | ) |
| 110 | ); |