Add extra fields in media attachment

add-extra-fields-media-attachment.php

<?php
/* Add extra fields in media attachment */
/**
 * Add Photographer Name and URL fields to media uploader
 *
 * @param $form_fields array, fields to include in attachment form
 * @param $post object, attachment record in database
 * @return $form_fields, modified form fields
 */
 
function custom_image_class_field( $form_fields, $post ) {
	$form_fields['image-class-name'] = array(
		'label' => 'Image Class',
		'input' => 'text',
		'value' => get_post_meta( $post->ID, 'image_class_name', true ),
		'helps' => 'Please provide image class eg. icons, coupons etc.',
	);

	/*$form_fields['be-photographer-url'] = array(
		'label' => 'Photographer URL',
		'input' => 'text',
		'value' => get_post_meta( $post->ID, 'be_photographer_url', true ),
		'helps' => 'Add Photographer URL',
	);*/

	return $form_fields;
}

add_filter( 'attachment_fields_to_edit', 'custom_image_class_field', 10, 2 );

/**
 * Save values of Photographer Name and URL in media uploader
 *
 * @param $post array, the post data for database
 * @param $attachment array, attachment fields from $_POST form
 * @return $post array, modified post data
 */

function be_attachment_field_credit_save( $post, $attachment ) {
	if( isset( $attachment['image-class-name'] ) )
		update_post_meta( $post['ID'], 'image_class_name', $attachment['image-class-name'] );

	/*if( isset( $attachment['be-photographer-url'] ) )
update_post_meta( $post['ID'], 'be_photographer_url', esc_url( $attachment['be-photographer-url'] ) );*/

	return $post;
}

add_filter( 'attachment_fields_to_save', 'be_attachment_field_credit_save', 10, 2 );
/* Add extra fields in media attachment end */
?>