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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 |
|---|---|
| 2297 | $user_nicename = sanitize_title( $user_nicename ); |
| 2298 | |
| 2299 | /** |
| 2300 | * Filters a user's nicename before the user is created or updated. |
| 2301 | * |
| 2302 | * @since 2.0.3 |
| 2303 | * |
| 2304 | * @param string $user_nicename The user's nicename. |
| 2305 | */ |
| 2306 | $user_nicename = apply_filters( 'pre_user_nicename', $user_nicename ); |
| 2307 | |
| 2308 | // Check if the sanitized nicename is empty. |
| 2309 | if ( empty( $user_nicename ) ) { |
| 2310 | return new WP_Error( 'empty_user_nicename', __( 'Cannot create a user with an empty nicename.' ) ); |
| 2311 | } elseif ( mb_strlen( $user_nicename ) > 50 ) { |
| 2312 | return new WP_Error( 'user_nicename_too_long', __( 'Nicename may not be longer than 50 characters.' ) ); |
| 2313 | } |
| 2314 | |
| 2315 | $user_nicename_check = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->users WHERE user_nicename = %s AND user_login != %s LIMIT 1", $user_nicename, $user_login ) ); |