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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 |
|---|---|
| 950 | * refer to the metadata object type (comment, post, or user) and the meta |
| 951 | * key value, respectively. |
| 952 | * |
| 953 | * @since 3.3.0 |
| 954 | * |
| 955 | * @param mixed $meta_value Meta value to sanitize. |
| 956 | * @param string $meta_key Meta key. |
| 957 | * @param string $object_type Object type. |
| 958 | */ |
| 959 | return apply_filters( "sanitize_{$object_type}_meta_{$meta_key}", $meta_value, $meta_key, $object_type ); |
| 960 | } |
| 961 | |
| 962 | /** |
| 963 | * Registers a meta key. |
| 964 | * |
| 965 | * @since 3.3.0 |
| 966 | * @since 4.6.0 {@link https://core.trac.wordpress.org/ticket/35658 Modified |
| 967 | * to support an array of data to attach to registered meta keys}. Previous arguments for |
| 968 | * `$sanitize_callback` and `$auth_callback` have been folded into this array. |