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Add custom post type to AddQuicktag plugin for use the plugin on custom post types
* Plugin Name: Use AddQuicktag on my CPT
* Plugin URI:
* Description: Add custom post type 'my_custom_post_type' to AddQuicktag plugin
* Author: Frank Bültge
* Version: 0.0.1
* Licence: GPLv3
* Author URI:
// This file is not called from WordPress. We don't like that.
if ( ! function_exists( 'add_filter' ) ) {
echo "Hi there! I'm just a part of plugin, not much I can do when called directly.";
if ( ! function_exists( 'my_addquicktag_post_types' ) ) {
// add custom function to filter hook 'addquicktag_post_types'
add_filter( 'addquicktag_post_types', 'my_addquicktag_post_types' );
* Return array $post_types with custom post types strings
* @param $post_type Array
* @return $post_type Array
function my_addquicktag_post_types( $post_types ) {
$post_types[] = 'my_custom_post_type';
return $post_types;

in which file do I have to copy this code?

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