Hey there, let's get that global dealcity option showing up in your Yoast page titles. The core issue here is that Yoast's %%cf_dealcity%% variable only works with post-specific custom fields (stored in wp_postmeta), while your dealcity is a site-wide option (stored in wp_options). Even if you tried manually adding it as a custom field, that'd only apply to individual posts—not globally.

Here are two solid solutions to fix this:

Option 1: Create a Custom Yoast Variable #

This lets you add a dedicated %%dealcity%% variable to Yoast's replacement options, just like the built-in ones. Add this code to your theme's functions.php file (or a custom plugin for better portability):

// Add custom replacement logic for our dealcity option
add_filter('wpseo_replacements', 'add_dealcity_yoast_variable', 10, 2);
function add_dealcity_yoast_variable($replacements, $type) {
    // Target only title replacements (remove this check to use in meta descriptions too)
    if ($type === 'title') {
        $dealcity_value = get_option('dealcity');
        // Sanitize the value for safe use in titles
        $replacements['%%dealcity%%'] = !empty($dealcity_value) ? esc_html($dealcity_value) : '';
    }
    return $replacements;
}

// Register the variable in Yoast's backend so you can select it easily
add_filter('wpseo_available_replacements', 'register_dealcity_yoast_variable');
function register_dealcity_yoast_variable($available_replacements) {
    $available_replacements['dealcity'] = 'Global Deal City Option';
    return $available_replacements;
}

How to use it: #

1. Save the code and refresh your WordPress admin.
2. Go to any page/post's Yoast SEO settings, edit the title field.
3. You'll now see %%dealcity%% in the list of available variables—insert it wherever you want the value to appear.

Option 2: Directly Modify the Yoast Title Output #

If you prefer a more straightforward approach without adding a new variable, use the wpseo_title filter to inject the dealcity value directly into the final title string:

add_filter('wpseo_title', 'insert_dealcity_into_title');
function insert_dealcity_into_title($original_title) {
    $dealcity_value = get_option('dealcity');
    
    if (!empty($dealcity_value)) {
        // Example 1: Replace a placeholder in your Yoast title (e.g., {dealcity})
        $modified_title = str_replace('{dealcity}', esc_html($dealcity_value), $original_title);
        
        // Example 2: Prepend the dealcity value to the title
        // $modified_title = esc_html($dealcity_value) . ' | ' . $original_title;
        
        return $modified_title;
    }
    
    // If no dealcity value exists, return the original title
    return $original_title;
}

How to use it: #

1. Pick either example (or adjust to your needs) and add the code to functions.php.
2. In your Yoast title settings, use {dealcity} as a placeholder (if using Example 1) or let the code automatically prepend the value (Example 2).

Important Notes: #

• Always backup your functions.php before editing it, or use a child theme to avoid losing changes when your parent theme updates.
• Both methods pull the global dealcity value directly via get_option('dealcity'), so any updates to your custom settings page will automatically reflect in the Yoast titles.

内容的提问来源于stack exchange，提问作者chrislovessushi