Change the meta description on a specific page?

wordpress.stackexchange https://wordpress.stackexchange.com/questions/192358

  •  03-10-2020
  •  | 
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Question

I want to change the title and meta description on my homepage if it's opened on an android phone.

I have this code that changes the title, inside functions.php: 

/**
 Modify the front/home page title for Android devices
**/
add_filter( 'wp_title', function( $title )
{
    return
        ( is_front_page() || is_home() )
        && isset( $_SERVER['HTTP_USER_AGENT'] ) 
        && false !== stripos( $_SERVER['HTTP_USER_AGENT'], 'android' )
        ? 'Title Test'
        : $title;
}, PHP_INT_MAX );

This code works!

I am now trying to figure out how to change the meta description.

There is no filter for the meta description, I'm not so sure how the bloginfo('description') function work yet. I used echo bloginfo('description'); on the header.php file and got:

Just another WordPress site

Which is definitely not my meta description.

As far I understood, the description comes from the the theme (?).

Updates:

  • I can't add <meta name="description" content="test description ?>" /> to the <head> - It adds it to the existing one and doesn't take over it.

  • I tried running the two functions the commenter here suggested and it didn't work

    /**
 Modify the front/home page meta description for Android devices
**/
add_filter('option_blogdescription','replace_description');
function replace_description($description) {
    if ( (is_front_page() || is_home()) && isset( $_SERVER['HTTP_USER_AGENT'] ) && false !== stripos( $_SERVER['HTTP_USER_AGENT'], 'android' ) ){    
        $description = "test description";
    }
    return $description;
}

function replace_description($info, $show) {
  if ($show == 'description') {
    $info = "test android";
  }
return $info;
}
add_filter('bloginfo','replace_description',PHP_INT_MAX);
Was it helpful?

Solution

The meta description isn't part of the Twenty Fifteen theme.

You mentioned the Yoast plugin in a previous question yesterday, so I guess the meta description comes from there.

According to their API page, there's a filter called wpseo_metadesc that might be what you're looking for.

Here's an untested example:

/**
 * Change the Yoast meta description for Android devices on the front/home page.
 */
add_filter( 'wpseo_metadesc', function( $description )
{
    return 
        ( is_front_page() || is_home() ) 
        && isset( $_SERVER['HTTP_USER_AGENT'] ) 
        && false !== stripos( $_SERVER['HTTP_USER_AGENT'], 'android' )
        ? 'Some Android description!'
        : $description;

}, PHP_INT_MAX );
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