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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.
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1336 | * key value, respectively. |
1337 | * |
1338 | * @since 3.3.0 |
1339 | * |
1340 | * @param mixed $meta_value Metadata value to sanitize. |
1341 | * @param string $meta_key Metadata key. |
1342 | * @param string $object_type Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', |
1343 | * or any other object type with an associated meta table. |
1344 | */ |
1345 | return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}", $meta_value, $meta_key, $object_type ); |
1346 | } |
1347 |
|
1348 | /** |
1349 | * Registers a meta key. |
1350 | * |
1351 | * It is recommended to register meta keys for a specific combination of object type and object subtype. If passing |
1352 | * an object subtype is omitted, the meta key will be registered for the entire object type, however it can be partly |
1353 | * overridden in case a more specific meta key of the same name exists for the same object type and a subtype. |
1354 | * |