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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 |
---|---|
688 | $user = get_user_by('login', $username); |
689 | if ( ! $user ) { |
690 | /** |
691 | * Fires if a bad username is entered in the user authentication process. |
692 | * |
693 | * @since 2.7.0 |
694 | * |
695 | * @param array $cookie_elements An array of data for the authentication cookie. |
696 | */ |
697 | do_action( 'auth_cookie_bad_username', $cookie_elements ); |
698 | return false; |
699 | } |
700 |
|
701 | $pass_frag = substr($user->user_pass, 8, 4); |
702 |
|
703 | $key = wp_hash( $username . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme ); |
704 |
|
705 | // If ext/hash is not present, compat.php's hash_hmac() does not support sha256. |
706 | $algo = function_exists( 'hash' ) ? 'sha256' : 'sha1'; |