php removing www from url

问题

I am getting an error on a FB app when the url does not have the https or and has a www in the url. I am just going to strip the url of the www.

The code below adds the https if it is not in the url but how would I remove the www as well?

if(!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] == ""){
    $redirect = "https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
    header("HTTP/1.1 301 Moved Permanently");
    header("Location: $redirect");
}

回答1:

if(!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] == ""){
    $redirect = str_replace('www.', '', "https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
    header("HTTP/1.1 301 Moved Permanently");
    header("Location: $redirect");
}

easiest way.

回答2:

Try to do it using .htaccess

RewriteEngine On
RewriteCond %{HTTP_HOST} ^www.example.com$ [NC]
RewriteRule ^(.*)$ http://example.com/$1 [R=301,L]

回答3:

Here is a way to do it with your .htaccess with https

RewriteEngine On
RewriteCond %{HTTPS} !=on [OR]
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ https://%1/$1 [R=301,L]

• first line turns your RewriteEngine ... On
• second line checks to see if https is ... on or
• third line we check to see if the domain name starts with www
• fourth line if either of the above conditions match rewrite the domain

来源：https://stackoverflow.com/questions/34005517/php-removing-www-from-url