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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 |
|---|---|
| 1845 | $user_nicename = sanitize_title( $user_nicename ); |
| 1846 | |
| 1847 | /** |
| 1848 | * Filters a user's nicename before the user is created or updated. |
| 1849 | * |
| 1850 | * @since 2.0.3 |
| 1851 | * |
| 1852 | * @param string $user_nicename The user's nicename. |
| 1853 | */ |
| 1854 | $user_nicename = apply_filters( 'pre_user_nicename', $user_nicename ); |
| 1855 | |
| 1856 | $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 ) ); |
| 1857 | |
| 1858 | if ( $user_nicename_check ) { |
| 1859 | $suffix = 2; |
| 1860 | while ( $user_nicename_check ) { |
| 1861 | // user_nicename allows 50 chars. Subtract one for a hyphen, plus the length of the suffix. |
| 1862 | $base_length = 49 - mb_strlen( $suffix ); |
| 1863 | $alt_user_nicename = mb_substr( $user_nicename, 0, $base_length ) . "-$suffix"; |