function.php

<?php


// custom excerpt length
function themify_custom_excerpt_length( $length ) {
return 25;
}
add_filter( 'excerpt_length', 'themify_custom_excerpt_length', 999 );


// add more link to excerpt
function themify_custom_excerpt_more($more) {
global $post;
return '<a href="'. get_permalink($post->ID) . '" class="readmore">... read more ></a>';
}
add_filter('excerpt_more', 'themify_custom_excerpt_more');



// Add theme support for post thumbnails
add_theme_support('post-thumbnails');
add_image_size( 'custom_thumb', 280, 180, true);



// Add thumbnail to excerpt
add_filter( 'excerpt_thumbnail', 'the_excerpt' );
function excerpt_thumbnail($excerpt){
    if(is_single()) return $excerpt;
    global $post;
    if ( has_post_thumbnail() ) {
        $img .= '<div class="attachment-custom_thumb">'.get_the_post_thumbnail($post->ID, 'custom_thumb').'</div>';
    } else {
        $img = '';
    }
    return $img.$excerpt;
}