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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 |
|---|---|
| 4394 | /** |
| 4395 | * Filters the language attributes for display in the 'html' tag. |
| 4396 | * |
| 4397 | * @since 2.5.0 |
| 4398 | * @since 4.3.0 Added the `$doctype` parameter. |
| 4399 | * |
| 4400 | * @param string $output A space-separated list of language attributes. |
| 4401 | * @param string $doctype The type of HTML document (xhtml|html). |
| 4402 | */ |
| 4403 | return apply_filters( 'language_attributes', $output, $doctype ); |
| 4404 | } |
| 4405 | |
| 4406 | /** |
| 4407 | * Displays the language attributes for the 'html' tag. |
| 4408 | * |
| 4409 | * Builds up a set of HTML attributes containing the text direction and language |
| 4410 | * information for the page. |
| 4411 | * |
| 4412 | * @since 2.1.0 |