Change post title based on category

I figured this out by adding the following code to my functions.php

add_action( 'the_title', 'title_color', 10, 2 );
function title_color( $title, $post_id ) 
{
    if( has_category( 4, $post_id ) ) {
        $title = '<span class="red">' . $title . '</span>';
    }

    return $title;
}

Thanks

Basically what I am trying to achieve is to have the title changed of posts which are in category number 30.

My code is:

function adddd($title) {

if(has_category(’30’,$post->ID)){
$title = ‘Prefix ‘.$title;
}

return $title;
}
add_action(‘the_title’,’adddd’);
The code works, but has one issue. When I am inside the post which has that category, title is being changed for all other pages (which are called through the_title) too.

How can I change the title only to post titles which have that category, no matter what page I am on?

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Try this

function adddd($title) {

if(has_category(30,$post->ID)){
$title = ‘Prefix ‘.$title;
}

return $title;
}
add_action(‘the_title’,’adddd’);