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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 |
|---|---|
| 999 | /** |
| 1000 | * Filters whether a meta key is protected. |
| 1001 | * |
| 1002 | * @since 3.2.0 |
| 1003 | * |
| 1004 | * @param bool $protected Whether the key is protected. Default false. |
| 1005 | * @param string $meta_key Meta key. |
| 1006 | * @param string $meta_type Type of object metadata is for (e.g., comment, post, term, or user). |
| 1007 | */ |
| 1008 | return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type ); |
| 1009 | } |
| 1010 | |
| 1011 | /** |
| 1012 | * Sanitize meta value. |
| 1013 | * |
| 1014 | * @since 3.1.3 |
| 1015 | * @since 4.9.8 The `$object_subtype` parameter was added. |
| 1016 | * |
| 1017 | * @param string $meta_key Meta key. |