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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 |
|---|---|
| 1047 | * refer to the metadata object type (comment, post, term, or user) and the meta |
| 1048 | * key value, respectively. |
| 1049 | * |
| 1050 | * @since 3.3.0 |
| 1051 | * |
| 1052 | * @param mixed $meta_value Meta value to sanitize. |
| 1053 | * @param string $meta_key Meta key. |
| 1054 | * @param string $object_type Object type. |
| 1055 | */ |
| 1056 | return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}", $meta_value, $meta_key, $object_type ); |
| 1057 | } |
| 1058 | |
| 1059 | /** |
| 1060 | * Registers a meta key. |
| 1061 | * |
| 1062 | * It is recommended to register meta keys for a specific combination of object type and object subtype. If passing |
| 1063 | * an object subtype is omitted, the meta key will be registered for the entire object type, however it can be partly |
| 1064 | * overridden in case a more specific meta key of the same name exists for the same object type and a subtype. |
| 1065 | * |