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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 |
|---|---|
| 806 | |
| 807 | /** |
| 808 | * Filters the list of CSS body class names for the current post or page. |
| 809 | * |
| 810 | * @since 2.8.0 |
| 811 | * |
| 812 | * @param string[] $classes An array of body class names. |
| 813 | * @param string[] $class An array of additional class names added to the body. |
| 814 | */ |
| 815 | $classes = apply_filters( 'body_class', $classes, $class ); |
| 816 | |
| 817 | return array_unique( $classes ); |
| 818 | } |
| 819 | |
| 820 | /** |
| 821 | * Whether post requires password and correct password has been provided. |
| 822 | * |
| 823 | * @since 2.7.0 |
| 824 | * |