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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 |
|---|---|
| 870 | * Passing an empty array to this hook will disable output of the setting on the |
| 871 | * signup form, and the default language will be used when creating the site. |
| 872 | * |
| 873 | * Languages not already installed will be stripped. |
| 874 | * |
| 875 | * @since 4.4.0 |
| 876 | * |
| 877 | * @param array $available_languages Available languages. |
| 878 | */ |
| 879 | $languages = (array) apply_filters( 'signup_get_available_languages', get_available_languages() ); |
| 880 | |
| 881 | /* |
| 882 | * Strip any non-installed languages and return. |
| 883 | * |
| 884 | * Re-call get_available_languages() here in case a language pack was installed |
| 885 | * in a callback hooked to the 'signup_get_available_languages' filter before this point. |
| 886 | */ |
| 887 | return array_intersect_assoc( $languages, get_available_languages() ); |
| 888 | } |