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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 |
|---|---|
| 624 | $user = get_user_by('login', $username); |
| 625 | if ( ! $user ) { |
| 626 | /** |
| 627 | * Fires if a bad username is entered in the user authentication process. |
| 628 | * |
| 629 | * @since 2.7.0 |
| 630 | * |
| 631 | * @param array $cookie_elements An array of data for the authentication cookie. |
| 632 | */ |
| 633 | do_action( 'auth_cookie_bad_username', $cookie_elements ); |
| 634 | return false; |
| 635 | } |
| 636 | |
| 637 | $pass_frag = substr($user->user_pass, 8, 4); |
| 638 | |
| 639 | $key = wp_hash( $username . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme ); |
| 640 | |
| 641 | // If ext/hash is not present, compat.php's hash_hmac() does not support sha256. |
| 642 | $algo = function_exists( 'hash' ) ? 'sha256' : 'sha1'; |