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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 |
|---|---|
| 1042 | /** |
| 1043 | * Filters whether a meta key is considered protected. |
| 1044 | * |
| 1045 | * @since 3.2.0 |
| 1046 | * |
| 1047 | * @param bool $protected Whether the key is considered protected. |
| 1048 | * @param string $meta_key Meta key. |
| 1049 | * @param string|null $meta_type Type of object metadata is for (e.g., comment, post, term, or user). |
| 1050 | */ |
| 1051 | return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type ); |
| 1052 | } |
| 1053 | |
| 1054 | /** |
| 1055 | * Sanitize meta value. |
| 1056 | * |
| 1057 | * @since 3.1.3 |
| 1058 | * @since 4.9.8 The `$object_subtype` parameter was added. |
| 1059 | * |
| 1060 | * @param string $meta_key Meta key. |