Analysis of WordPress Control user Login and judge user login PHP function _php skills

Login function: Wp_signon ()

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

function uses:

<?php Wp_signon ($credentials, $secure _cookie)?> 

Parameter description:

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

Note: If you do not provide $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 success 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->get_error_message ();

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

Determine whether the user login function: is_user_logged_in ()

Function Description:
The is_user_logged_in () function returns False if the user has logged in to return True because it determines whether the user is logged in.

function uses:

<?php if (is_user_logged_in ()) {...}?> 

Function arguments:
The function does not accept any arguments.

return value:
(Boolean)
Login returns True, otherwise returns false.

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

<?php
if (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.