Single post thumbnail image in wordpress

For adding WordPress Post Thumbnail Image to every post, you need to first edit the wordpress theme functions.php file and add this below code:

add_action( 'after_setup_theme', 'bn_theme_support' );

function bn_theme_support() {
add_theme_support( 'post-thumbnails' ); // This line of code will add featured image option in post writting area.
add_image_size( 'post-thumb', 150, 150, true ); // This line of code is image size in width and height.
}

Now open index.php file or other related files that contain the main content and add this below code to display WordPress Post Thumbnail Image somewhere in those file:

<?php if ( has_post_thumbnail() ) : the_post_thumbnail('post-thumb'); endif; // This line of code will display Thumbnail Image ?>

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