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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 |
|---|---|
| 2138 | $user_nicename = sanitize_title( $user_nicename ); |
| 2139 | |
| 2140 | /** |
| 2141 | * Filters a user's nicename before the user is created or updated. |
| 2142 | * |
| 2143 | * @since 2.0.3 |
| 2144 | * |
| 2145 | * @param string $user_nicename The user's nicename. |
| 2146 | */ |
| 2147 | $user_nicename = apply_filters( 'pre_user_nicename', $user_nicename ); |
| 2148 | |
| 2149 | if ( mb_strlen( $user_nicename ) > 50 ) { |
| 2150 | return new WP_Error( 'user_nicename_too_long', __( 'Nicename may not be longer than 50 characters.' ) ); |
| 2151 | } |
| 2152 | |
| 2153 | $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 ) ); |
| 2154 | |
| 2155 | if ( $user_nicename_check ) { |
| 2156 | $suffix = 2; |