Override meta description written by Yoast SEO in PHP

Yoast SEO provides the wpseo_metadesc hook for modifying the meta description before it is written to the HTML <meta> tag. If you need to override the description in some way, you can write a function that receives the pending description and returns a different value.

The following example illustrates how to modify the description. This code adds a filter function to wpseo_metadesc. The filter function will be called just before Yoast writes the meta description.

add_filter('wpseo_metadesc', function($description) {

    // This example overrides Yoast for single post-type objects
    // such as a blog post, page, or custom post type.
    if (is_singular()) {
    
        // Get access to the current post being queried or displayed.
        global $post;
        
        // Implement your custom meta description here
        return your_code_or_function($post);
    }
    
    // Fallback to Yoast's description for other post-types
    return $description;
});

add_filter('wpseo_metadesc', function($description) {

    // This example overrides Yoast for single post-type objects
    // such as a blog post, page, or custom post type.
    if (is_singular()) {
    
        // Get access to the current post being queried or displayed.
        global $post;
        
        // Implement your custom meta description here
        return your_code_or_function($post);
    }
    
    // Fallback to Yoast's description for other post-types
    return $description;
});

Reference

• add_filter() – Function | Developer.WordPress.org – Developer documentation for the add_filter function.
• Yoast SEO Meta descriptions: API documentation | Yoast developer portal – Yoast SEO developer documentation.