How can I override the post title when a post is set to sticky? [closed]

Let’s say you wanna prepend the word “Special: ” to every stick post’s title you can place the following in your functions.php:

add_filter( 'the_title', 'sticky_title' );
function sticky_title( $title ) {

    // Check if a post is set to sticky.
    if ( is_sticky() ) {

        // Prepend "Special: " to post title.
        return 'Special: ' . $title;
    }

    return $title;
}

---

I want’s to design this ‘special : ‘ word into different color and i
wants this will appear my every sticky post’s left corner… How can i
do this?

You could do that with just CSS using post_class() or by hooking into post_class(). Normally the <article> tag already comes with a .sticky class.

If you use a custom theme you can simply have a look at the Twenty Nineteen theme’s template-parts/content/content.php and use that approach yourself in your home.php or in whatever template you need it:

if ( is_sticky() && is_home() && ! is_paged() ) {
    printf( '<span class="sticky-post">%s</span>', _x( 'Featured', 'post', 'twentynineteen' ) );
}