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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 |
|---|---|
| 1991 | /** |
| 1992 | * Filters whether the given username exists. |
| 1993 | * |
| 1994 | * @since 4.9.0 |
| 1995 | * |
| 1996 | * @param int|false $user_id The user ID associated with the username, |
| 1997 | * or false if the username does not exist. |
| 1998 | * @param string $username The username to check for existence. |
| 1999 | */ |
| 2000 | return apply_filters( 'username_exists', $user_id, $username ); |
| 2001 | } |
| 2002 | |
| 2003 | /** |
| 2004 | * Determines whether the given email exists. |
| 2005 | * |
| 2006 | * For more information on this and similar theme functions, check out |
| 2007 | * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ |
| 2008 | * Conditional Tags} article in the Theme Developer Handbook. |
| 2009 | * |