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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 |
|---|---|
| 813 | * |
| 814 | * @since 3.1.3 |
| 815 | * |
| 816 | * @param string $meta_key Meta key |
| 817 | * @return bool True if the key is protected, false otherwise. |
| 818 | */ |
| 819 | function is_protected_meta( $meta_key, $meta_type = null ) { |
| 820 | $protected = ( '_' == $meta_key[0] ); |
| 821 | |
| 822 | return apply_filters( 'is_protected_meta', $protected, $meta_key, $meta_type ); |
| 823 | } |
| 824 | |
| 825 | /** |
| 826 | * Sanitize meta value |
| 827 | * |
| 828 | * @since 3.1.3 |
| 829 | * |
| 830 | * @param string $meta_key Meta key |
| 831 | * @param mixed $meta_value Meta value to sanitize |