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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 |
---|---|
888 | * |
889 | * @since 3.1.3 |
890 | * |
891 | * @param string $meta_key Meta key |
892 | * @return bool True if the key is protected, false otherwise. |
893 | */ |
894 | function is_protected_meta( $meta_key, $meta_type = null ) { |
895 | $protected = ( '_' == $meta_key[0] ); |
896 |
|
897 | return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type ); |
898 | } |
899 |
|
900 | /** |
901 | * Sanitize meta value |
902 | * |
903 | * @since 3.1.3 |
904 | * |
905 | * @param string $meta_key Meta key |
906 | * @param mixed $meta_value Meta value to sanitize |