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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 |
|---|---|
| 1794 | /** |
| 1795 | * Filters a username after it has been sanitized. |
| 1796 | * |
| 1797 | * This filter is called before the user is created or updated. |
| 1798 | * |
| 1799 | * @since 2.0.3 |
| 1800 | * |
| 1801 | * @param string $sanitized_user_login Username after it has been sanitized. |
| 1802 | */ |
| 1803 | $pre_user_login = apply_filters( 'pre_user_login', $sanitized_user_login ); |
| 1804 | |
| 1805 | // Remove any non-printable chars from the login string to see if we have ended up with an empty username. |
| 1806 | $user_login = trim( $pre_user_login ); |
| 1807 | |
| 1808 | // user_login must be between 0 and 60 characters. |
| 1809 | if ( empty( $user_login ) ) { |
| 1810 | return new WP_Error( 'empty_user_login', __( 'Cannot create a user with an empty login name.' ) ); |
| 1811 | } elseif ( mb_strlen( $user_login ) > 60 ) { |
| 1812 | return new WP_Error( 'user_login_too_long', __( 'Username may not be longer than 60 characters.' ) ); |