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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 |
|---|---|
| 722 | $user = get_user_by( 'login', $username ); |
| 723 | if ( ! $user ) { |
| 724 | /** |
| 725 | * Fires if a bad username is entered in the user authentication process. |
| 726 | * |
| 727 | * @since 2.7.0 |
| 728 | * |
| 729 | * @param string[] $cookie_elements An array of data for the authentication cookie. |
| 730 | */ |
| 731 | do_action( 'auth_cookie_bad_username', $cookie_elements ); |
| 732 | return false; |
| 733 | } |
| 734 | |
| 735 | $pass_frag = substr( $user->user_pass, 8, 4 ); |
| 736 | |
| 737 | $key = wp_hash( $username . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme ); |
| 738 | |
| 739 | // If ext/hash is not present, compat.php's hash_hmac() does not support sha256. |
| 740 | $algo = function_exists( 'hash' ) ? 'sha256' : 'sha1'; |