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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 |
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58 | 'meta_key' => $meta_key, |
59 | 'meta_value' => $meta_value |
60 | ) ); |
61 |
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62 | wp_cache_delete($object_id, $meta_type . '_meta'); |
63 | // users cache stores usermeta that must be cleared. |
64 | if ( 'user' == $meta_type ) |
65 | clean_user_cache($object_id); |
66 |
|
67 | do_action( "added_{$meta_type}_meta", $wpdb->insert_id, $object_id, $meta_key, $_meta_value ); |
68 |
|
69 | return true; |
70 | } |
71 |
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72 | /** |
73 | * Update metadata for the specified object. If no value already exists for the specified object |
74 | * ID and metadata key, the metadata will be added. |
75 | * |
76 | * @since 2.9.0 |