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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 |
|---|---|
| 844 | |
| 845 | /** |
| 846 | * Filters the list of CSS body class names for the current post or page. |
| 847 | * |
| 848 | * @since 2.8.0 |
| 849 | * |
| 850 | * @param string[] $classes An array of body class names. |
| 851 | * @param string[] $class An array of additional class names added to the body. |
| 852 | */ |
| 853 | $classes = apply_filters( 'body_class', $classes, $class ); |
| 854 | |
| 855 | return array_unique( $classes ); |
| 856 | } |
| 857 | |
| 858 | /** |
| 859 | * Determines whether the post requires password and whether a correct password has been provided. |
| 860 | * |
| 861 | * @since 2.7.0 |
| 862 | * |