mypmpro-discount-code-description.php

<?php // do not copy

/**
 * This recipe will add a Description field to each discount code. This is then visible on the
 * Discount Codes page for admin reference.
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function mypmpro_discount_code_notes_field( $edit ){

	if( $_REQUEST['edit'] !== "-1" ) {

		?>
		<table class="form-table">
			<tbody>
				<tr>
					<th scope="row" valign="top">
						<label for="uses">Description</label>
					</th>
					<td>
						<textarea name='discount_description' style='width: 30%;' rows='4'><?php echo str_replace( "<br />", "", get_option( 'discount_code_description_'.$edit ) ); ?></textarea>
					</td>
				</tr>
			</tbody>
		</table>
		<?php
	} else {
		_e('You will need to save your discount code before you can enter a description' );
	}

}
add_action( 'pmpro_discount_code_after_settings', 'mypmpro_discount_code_notes_field', 10, 1 );

function mypmpro_save_discount_code_note(){

	if( isset( $_REQUEST['discount_description'] ) ){

		$save_id = intval( $_REQUEST['saveid'] );
		$description = nl2br( $_REQUEST['discount_description'] );

		update_option( 'discount_code_description_'.$save_id, $description );

	}

}
add_action( 'admin_init', 'mypmpro_save_discount_code_note' );

function mypmpro_discount_page_header( $codes ){

	echo "<th>Description</th>";

}
add_action( 'pmpro_discountcodes_extra_cols_header', 'mypmpro_discount_page_header', 10, 1 );

function mypmpro_discount_page_column( $code ){

	echo "<td>".get_option( 'discount_code_description_'.$code->id )."</td>";

}
add_action( 'pmpro_discountcodes_extra_cols_body', 'mypmpro_discount_page_column', 10, 1 );