add-order-item-meta-&-item-meta.php

<?php

/*
Plugin Name: Add Item Meta & Order Meta for your WooComerce order
Description: A simple demo plugin on how to add add cart item meta & order item meta for your WooComerce order.
Author: Bhavik Kiri
Version: 1.0
*/
add_action( 'woocommerce_before_add_to_cart_button', 'add_fields_before_add_to_cart' );

function add_fields_before_add_to_cart( ) {
	?>
	<table>
		<tr>
			<td>
				<?php _e( "Name:", "aoim"); ?>
			</td>
			<td>
				<input type = "text" name = "customer_name" id = "customer_name" placeholder = "Name on Gift Card">
			</td>
		</tr>
		<tr>
			<td>
				<?php _e( "Message:", "aoim"); ?>
			</td>
			<td>
				<input type = "text" name = "customer_message" id = "customer_message" placeholder = "Your Message on Gift Card">
			</td>
		</tr>
	</table>
	<?php
}


/**
 * Add data to cart item
 */
add_filter( 'woocommerce_add_cart_item_data', 'add_cart_item_data', 25, 2 );

function add_cart_item_data( $cart_item_meta, $product_id ) {

	if ( isset( $_POST ['customer_name'] ) && isset( $_POST ['customer_message'] ) ) {
		$custom_data  = array() ;
		$custom_data [ 'customer_name' ]    = isset( $_POST ['customer_name'] ) ?  sanitize_text_field ( $_POST ['customer_name'] ) : "" ;
		$custom_data [ 'customer_message' ] = isset( $_POST ['customer_message'] ) ? sanitize_text_field ( $_POST ['customer_message'] ): "" ;

		$cart_item_meta ['custom_data']     = $custom_data ;
	}
	
	return $cart_item_meta;
}

/**
 * Display the custom data on cart and checkout page
 */
add_filter( 'woocommerce_get_item_data', 'get_item_data' , 25, 2 );

function get_item_data ( $other_data, $cart_item ) {

	if ( isset( $cart_item [ 'custom_data' ] ) ) {
		$custom_data  = $cart_item [ 'custom_data' ];
			
		$other_data[] =   array( 'name' => 'Name',
					 'display'  => $custom_data['customer_name'] );
		$other_data[] =   array( 'name' => 'Message',
					 'display'  => $custom_data['customer_message'] );
	}
	
	return $other_data;
}

/**
 * Add order item meta
 */

add_action( 'woocommerce_add_order_item_meta', 'add_order_item_meta' , 10, 2);

function add_order_item_meta ( $item_id, $values ) {

	if ( isset( $values [ 'custom_data' ] ) ) {

		$custom_data  = $values [ 'custom_data' ];
		wc_add_order_item_meta( $item_id, 'Name', $custom_data['customer_name'] );
		wc_add_order_item_meta( $item_id, 'Message', $custom_data['customer_message'] );
	}
}