Parsing PHP functions that control user login and judge user login in WordPress

Login function: Wp_signon ()

Function Description:
The Wp_signon () function is used to authorize users to log on to WordPress and remember the user name. This function replaces the wp_login. The WordPress 2.5 version is enabled.

function use:

Parameter description:

• $credentials
• (array) (optional) login user information.
• Default:none
• $secure _cookie
• (Boolean) (optional) Decide whether to use a security cookie.
• Default:none

Note: If you do not provide a $credentials, Wp_signon uses the $_post parameter (the key value is "log", "pwd" and "RememberMe").

function return value:
(object)
Login failed return object Wp_error, login successful return Wp_user

function instance:

$creds = Array (); $creds [' user_login '] = ' example '; Wordperss background user name $creds[' user_password '] = ' 123456 '; Wordperss Background user password $creds[' remember ' = true; $user = Wp_signon ($creds, false); if (Is_wp_error ($user))  echo $user-&G T;get_error_message ();

Source file:
Wp_signon () is located in wp-includes/user.php.

Determine if the user is logged in: is_user_logged_in ()

Function Description:
The is_user_logged_in () function returns false because it determines whether the user is logged on or not and returns true if the user has logged in.

function use:

Function parameters:
The function does not accept any arguments.

return value:
(Boolean)
Logged in returns True, otherwise false is returned.

function instance:
The following example shows what is displayed by the logged on user or the user who is not logged in:

<?phpif (is_user_logged_in ()) {  echo ' Welcome, Registered user! ';} else {  echo ' Welcome, visitor! ';}? >

Source file:
Is_user_logged_in () is located in the file wp-includes/pluggable.php.

The above describes the analysis of the WordPress control user login and judge the user login PHP function, including the content, I hope the PHP tutorial interested in a friend to help.

