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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 |
|---|---|
| 3612 | /** |
| 3613 | * Filters the language attributes for display in the html tag. |
| 3614 | * |
| 3615 | * @since 2.5.0 |
| 3616 | * @since 4.3.0 Added the `$doctype` parameter. |
| 3617 | * |
| 3618 | * @param string $output A space-separated list of language attributes. |
| 3619 | * @param string $doctype The type of html document (xhtml|html). |
| 3620 | */ |
| 3621 | return apply_filters( 'language_attributes', $output, $doctype ); |
| 3622 | } |
| 3623 | |
| 3624 | /** |
| 3625 | * Displays the language attributes for the html tag. |
| 3626 | * |
| 3627 | * Builds up a set of html attributes containing the text direction and language |
| 3628 | * information for the page. |
| 3629 | * |
| 3630 | * @since 2.1.0 |