Wants to add content PHP file to the end of post content?
You might look below snipped to do the same.
add_filter('the_content', 'UpdateContent');
function UpdateContent($content)
{
global $post;
//output buffer start
ob_start();
include(plugin_dir_path(__FILE__) . 'plugin_test_file.php');
//clean output buffer and returns its content
$append = ob_get_clean();
return $content. $append;
}
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