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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 |
|---|---|
| 923 | /** |
| 924 | * Filter whether a meta key is protected. |
| 925 | * |
| 926 | * @since 3.2.0 |
| 927 | * |
| 928 | * @param bool $protected Whether the key is protected. Default false. |
| 929 | * @param string $meta_key Meta key. |
| 930 | * @param string $meta_type Meta type. |
| 931 | */ |
| 932 | return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type ); |
| 933 | } |
| 934 | |
| 935 | /** |
| 936 | * Sanitize meta value. |
| 937 | * |
| 938 | * @since 3.1.3 |
| 939 | * |
| 940 | * @param string $meta_key Meta key |
| 941 | * @param mixed $meta_value Meta value to sanitize |