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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 |
|---|---|
| 11 | } |
| 12 | |
| 13 | function validate_username( $username ) { |
| 14 | $name = sanitize_user($username, true); |
| 15 | $valid = true; |
| 16 | |
| 17 | if ( $name != $username ) |
| 18 | $valid = false; |
| 19 | |
| 20 | return apply_filters('validate_username', $valid, $username); |
| 21 | } |
| 22 | |
| 23 | function wp_insert_user($userdata) { |
| 24 | global $wpdb; |
| 25 | |
| 26 | extract($userdata); |
| 27 | |
| 28 | // Are we updating or creating? |
| 29 | if ( !empty($ID) ) { |