Changing the color scheme based on the url visited

Question

I am battling with the following:

    $themeId = "";
    $pathname = get_site_url();

    if($pathname == 'domain2.com'){
        $themeId =  "gold";}
    else{ 
        $themeId = "blue";}

    wp_register_style('theme-skin',THEMEURI . '/css/'.get_option($themeId).'-style.css', 3 , false, 'all');

So basically, I have a domain, domain1.com. It uses a blue theme for wordpress and hence the blue stylesheet which is: blue-style.css.

Now, I have another domain name, domain2.com, that uses the exact same wordpress installation. So I want to get the current url in the address bar, and based on that, change the color scheme, blue for domain1.com and gold for domain2.com.

But my code above does not work, it keeps using blue, no matter what url is visited - What am I doing wrong here?

Thanks

UPDATE: The original Default code

theme.css

        if(get_option(THEMESLUG."_17_style")){          
            wp_register_style('theme-skin',THEMEURI . '/css/'.get_option( THEMESLUG."_17_style").'-style.css', 3 , false, 'all'); //dark skin               
        }

Where the colors are specified: styling-options.php

array(
        "name"      => __("Theme Style",'rt_theme_admin'),
        "desc"      => __("Please choose a style for your theme.",'rt_theme_admin'),
        "id"        => THEMESLUG."_17_style",
        "options"   =>  array(
                        "blue"     => "Blue Style",
                        "purple"   => "Purple Style", 
                        "orange"   => "Orange Style",                       
                        "brown"   => "Brown Style",                                                 
                        "rose"   => "Rose Style",       
                        "green"   => "Green Style",     
                        "grey"   => "Grey Style",       
                        "gold"   => "Gold Style",                               
                        ),
        "default"   => "blue", 
        "type"      => "select"), 

---

SOLVED

Hi All. I did the following, and it now works:

if ( 'domain2.com' === $_SERVER['HTTP_HOST'] ) {

wp_register_style('theme-skin',THEMEURI . '/css/gold-style.css', 3 , false, 'all');

} else {

wp_register_style('theme-skin',THEMEURI . '/css/blue-style.css', 3 , false, 'all'); 

}

Answer 1

The Misconception

get_site_url() retrieves the site_url option from the database, as set under General Settings in the administrative backend / wp-admin.

If this is indeed

the exact same wordpress installation

it will always return the same thing, regardless of whether the location is reachable via one, two or five hundred domains.

You might want to check $_SERVER['HTTP_HOST'] instead.

if ( 'domain2.com' === $_SERVER['HTTP_HOST'] ) {
    $themeId =  "gold";
} else { 
    $themeId = "blue";
}

Real Voodoo

So far, your condition only works for the initial visit to your site.
Should you care for some real trickery and want the visitor to keep surfing your page under the initial domain: Check out this excellent answer by toscho.

Answer 2

If you refer to the Codex page for get_site_url():

Returns the 'siteurl' option with the appropriate protocol, 'https' if is_ssl() and 'http' otherwise.

so you should be checking a match for the domain with protocol, http://domain2.com

Answer 3

get_site_url will display the complete URL-- for example, http://domain2.com. You can see that simply by dumping the output and looking at it. You are trying to match that against domain2.com. Obviously, it does not match and never will.

Try using:

    if($pathname == 'http://domain2.com'){
        $themeId =  "gold";}
    else{ 
        $themeId = "blue";}

But that could break if SSL is enabled, or if it is enabled in the future. Perhaps this would work better:

$pathname = parse_url(get_site_url());
echo $pathname['host'];
if($pathname['host'] == 'domain2.com'){
    $themeId =  "gold";
} else { 
    $themeId = "blue";
}