How to Display posts thumbnail in dashboard all posts row in first column?

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I use the below code . But the code display Thumbnail in the five number column. How to move it first column position? 

//show Thumbnail in dashboard
function my_function_admin_bar(){ return false; }
add_filter( 'show_admin_bar' , 'my_function_admin_bar');

add_image_size( 'admin-list-thumb', 80, 80, false );

add_filter('manage_posts_columns', 'tcb_add_post_thumbnail_column', 1);
add_filter('manage_pages_columns', 'tcb_add_post_thumbnail_column', 1);

function tcb_add_post_thumbnail_column($cols){
$cols['tcb_post_thumb'] = __('Thumbnail');
return $cols;
}

add_action('manage_posts_custom_column', 'tcb_display_post_thumbnail_column', 1, 2);
add_action('manage_pages_custom_column', 'tcb_display_post_thumbnail_column', 1, 2);

function tcb_display_post_thumbnail_column($col, $id){
switch($col){
case 'tcb_post_thumb':
if( function_exists('the_post_thumbnail') )
echo the_post_thumbnail( 'admin-list-thumb' );
else
echo 'Not supported in theme';
break;
}
}

2 Answers
2

You can add featured image thumbnail in post column with this code.

Copied from here Add Featured Post Thumbnails to WordPress Admin Post Columns.
Haven’t tried it myself but it must work.

add_image_size( 'admin-list-thumb', 80, 80, false );

// add featured thumbnail to admin post columns
function wpcs_add_thumbnail_columns( $columns ) {
    $columns = array(
        'cb' => '<input type="checkbox" />',
        'featured_thumb' => 'Thumbnail',
        'title' => 'Title',
        'author' => 'Author',
        'categories' => 'Categories',
        'tags' => 'Tags',
        'comments' => '<span class="vers"><div title="Comments" class="comment-grey-bubble"></div></span>',
        'date' => 'Date'
    );
    return $columns;
}

function wpcs_add_thumbnail_columns_data( $column, $post_id ) {
    switch ( $column ) {
    case 'featured_thumb':
        echo '<a href="' . get_edit_post_link() . '">';
        echo the_post_thumbnail( 'admin-list-thumb' );
        echo '</a>';
        break;
    }
}

if ( function_exists( 'add_theme_support' ) ) {
    add_filter( 'manage_posts_columns' , 'wpcs_add_thumbnail_columns' );
    add_action( 'manage_posts_custom_column' , 'wpcs_add_thumbnail_columns_data', 10, 2 );
    add_filter( 'manage_pages_columns' , 'wpcs_add_thumbnail_columns' );
    add_action( 'manage_pages_custom_column' , 'wpcs_add_thumbnail_columns_data', 10, 2 );
}

EDIT

Just tried it and it’s working fine.

Although it works fine out of the box but you can change thumbnail size in above code if you want to use your custom defined image size.

EDIT

Just fixed this code for 80×80 thumbnail.

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