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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 |
|---|---|
| 853 | |
| 854 | /** |
| 855 | * Filters the list of CSS body class names for the current post or page. |
| 856 | * |
| 857 | * @since 2.8.0 |
| 858 | * |
| 859 | * @param string[] $classes An array of body class names. |
| 860 | * @param string[] $css_class An array of additional class names added to the body. |
| 861 | */ |
| 862 | $classes = apply_filters( 'body_class', $classes, $css_class ); |
| 863 | |
| 864 | return array_unique( $classes ); |
| 865 | } |
| 866 | |
| 867 | /** |
| 868 | * Determines whether the post requires password and whether a correct password has been provided. |
| 869 | * |
| 870 | * @since 2.7.0 |
| 871 | * |