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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 |
|---|---|
| 27 | |
| 28 | /** |
| 29 | * Checks whether an username is valid. |
| 30 | * @param string $username Username. |
| 31 | * @return bool A filtered boolean. |
| 32 | */ |
| 33 | function validate_username( $username ) { |
| 34 | $sanitized = sanitize_user( $username, true ); |
| 35 | $valid = ( $sanitized == $username ); |
| 36 | return apply_filters( 'validate_username', $valid, $username ); |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * Insert an user into the database. |
| 41 | * @global object $wpdb WordPress database layer. |
| 42 | * @param array $userdata An array of user data. |
| 43 | * @return int The newly created user's ID. |
| 44 | */ |
| 45 | function wp_insert_user($userdata) { |