The “fun_attachment_fields” filter is used to add additional input fields to the edit image form.

A plugin (or theme) can modify the output with the code:

<?php add_filter( 'fun_attachment_fields', 'filter_function_name'); ?>

The hook is located in the file-un-attach/_inc/admin.php file.


// Apply filter
function add_fun_attachment_fields( $form_fields, $image ) {
	return form_fields['site'] = array( 
		'input' => 'html',
		'label' => __( 'Site' ),
		'html' => '<input name="site" id="site" value="sitename" type="text" />' 
add_filter('fun_attachment_fields', 'add_fun_attachment_fields');

Note:  $output is a HTML string, $image is an object.

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