wp_signon( array $credentials = array(), string|bool $secure_cookie = '' );
function custom_login() {
if (isset($_POST['submit'])) {
$login_data = array();
$login_data['user_login'] = sanitize_user($_POST['username']);
$login_data['user_password'] = esc_attr($_POST['password']);
$user = wp_signon( $login_data, false );
if ( is_wp_error($user) ) {
echo $user->get_error_message();
} else {
wp_clear_auth_cookie();
do_action('wp_login', $user->ID);
wp_set_current_user($user->ID);
wp_set_auth_cookie($user->ID, true);
$redirect_to = $_SERVER['REQUEST_URI'];
wp_safe_redirect($redirect_to);
exit;
}
}
}
add_action( 'after_setup_theme', 'custom_login' );
https://stackoverflow.com/questions/5335833/wordpress-wp-signon-function-not-working/
wp_signon() needs to run before you've sent any of your actual page to the browser.
This is because part of what wp_signon() does is to set your authentication cookies. It does this by outputting a "Set-Cookie: ..." header -- if you look at line 690 of pluggable.php (wp-includes\pluggable.php), where your error comes from, you'll see that that line sets a cookie.
So, because wp_signon() outputs headers, you can't already have sent any content -- because headers must always be output before content.
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