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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 |
|---|---|
| 3734 | /** |
| 3735 | * Filters the language attributes for display in the html tag. |
| 3736 | * |
| 3737 | * @since 2.5.0 |
| 3738 | * @since 4.3.0 Added the `$doctype` parameter. |
| 3739 | * |
| 3740 | * @param string $output A space-separated list of language attributes. |
| 3741 | * @param string $doctype The type of html document (xhtml|html). |
| 3742 | */ |
| 3743 | return apply_filters( 'language_attributes', $output, $doctype ); |
| 3744 | } |
| 3745 | |
| 3746 | /** |
| 3747 | * Displays the language attributes for the html tag. |
| 3748 | * |
| 3749 | * Builds up a set of html attributes containing the text direction and language |
| 3750 | * information for the page. |
| 3751 | * |
| 3752 | * @since 2.1.0 |