alfred-quick-gist

<?php

/**
 * Insert two test fields. One standard input, one textarea.
 */
add_filter( 'attachment_fields_to_edit', function( $form_fields, $post ) {

	$form_fields['testing-input-field'] = array(
		'label' => 'input test',
		'input' => 'html',
		'value' => get_post_meta( $post->ID, 'testing-input-field', true ),
		);

	$form_fields['testing-textarea-field'] = array(
		'label' => 'textarea test',
		'input' => 'textarea',
		'value' => get_post_meta( $post->ID, 'testing-textarea-field', true ),
		);

	return $form_fields;
}, 10, 2 );


/**
 * Save fields for sanity during testing
 */
add_filter( 'attachment_fields_to_save', function( $post, $attachment ) {

	if ( isset( $attachment['testing-input-field'] ) ) {
		update_post_meta($post['ID'], 'testing-input-field', $attachment['testing-input-field']);
	}

	if ( isset( $attachment['testing-textarea-field'] ) ) {
		update_post_meta($post['ID'], 'testing-textarea-field', $attachment['testing-textarea-field']);
	}

	return $post;

}, 10, 2 );