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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 |
|---|---|
| 43 | * @since 2.0.1 |
| 44 | * @uses apply_filters() Calls 'validate_username' hook on $valid check and $username as parameters |
| 45 | * |
| 46 | * @param string $username Username. |
| 47 | * @return bool Whether username given is valid |
| 48 | */ |
| 49 | function validate_username( $username ) { |
| 50 | $sanitized = sanitize_user( $username, true ); |
| 51 | $valid = ( $sanitized == $username ); |
| 52 | return apply_filters( 'validate_username', $valid, $username ); |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Insert an user into the database. |
| 57 | * |
| 58 | * Can update a current user or insert a new user based on whether the user's ID |
| 59 | * is present. |
| 60 | * |
| 61 | * Can be used to update the user's info (see below), set the user's role, and |