How to add default image to post without thumbnail?

Use the iworks_upprev_image action:

<?php
add_action( 'iworks_upprev_image' , 'default_image' );
function default_image()
{
    return '<img src="image.png" alt="" />';
}

Where to put this code?

There are three ways:

  1. made a one-file-plugin and put file into wp-content/plugins, then turn it on
  2. made a one-file-plugin and put file into wp-content/mu-plugins
  3. put this code into functions.php in current theme

I recommend using option 1 or 2, but 3 is the easiest.

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