How To Add Woocommerce Custom Product Fields | http://www.ibenic.com/how-to-add-woocommerce-custom-product-fields

checkbox_input.php

<?php

$args = array(
  'label' => '', // Text in Label
  'class' => '',
  'style' => '',
  'wrapper_class' => '',
  'value' => '', // if empty, retrieved from post meta where id is the meta_key
  'id' => '', // required
  'name' => '', //name will set from id if empty
  'cbvalue' => '',
  'desc_tip' => '',
  'custom_attributes' => '', // array of attributes 
  'description' => ''
);

woocommerce_wp_checkbox( $args );

general_tab.php

<?php

add_action( 'woocommerce_product_options_pricing', 'my_woo_custom_price_field' );
/**
* Add a Christmas Price field
**/
function my_woo_custom_price_field() {
  
  $field = array(
    'id' => 'christmas_price',
    'label' => __( 'Christmas Price', 'textdomain' ),
    'data_type' => 'price' //Let WooCommerce formats our field as price field
  );
  
  woocommerce_wp_text_input( $field );
}

add_action( 'woocommerce_product_options_general_product_data', 'my_woo_custom_fields' );
/**
* Add a select Field at the bottom
*/
function my_woo_custom_fields() {
  $select_field = array(
    'id' => 'my_select',
    'label' => __( 'Custom Select', 'textdomain' ),
    'options' => array(
      'value1' => __( 'Text 1', 'textdomain' ),
      'value2' => __( 'Text 2', 'textdomain' )
    )
  );
  woocommerce_wp_select( $select_field );
}

hidden_input.php

<?php
$args = array(
  'value' => '',
  'class' => '',
  'id' => ''
);

woocommerce_wp_hidden_input( $args );

radio_input.php

<?php

$args = array(
  'label' => '', // Text in Label
  'class' => '',
  'style' => '',
  'wrapper_class' => '',
  'value' => '', // if empty, retrieved from post meta where id is the meta_key
  'id' => '', // required
  'name' => '', //name will set from id if empty
  'options' => '', // Options for radio inputs, array
  'desc_tip' => '', 
  'description' => ''
);

woocommerce_wp_radio( $args );

save_product.php

<?php

add_action( 'woocommerce_process_product_meta', 'save_custom_field' );

function save_custom_field( $post_id ) {
  
  $custom_field_value = isset( $_POST['my_custom_input'] ) ? $_POST['my_custom_input'] : '';
  
  $product = wc_get_product( $post_id );
  $product->update_meta_data( 'my_custom_input', $custom_field_value );
  $product->save();

}

select_input.php

<?php


$args = array(
  'label' => '', // Text in Label
  'class' => '',
  'style' => '',
  'wrapper_class' => '',
  'value' => '', // if empty, retrieved from post meta where id is the meta_key
  'id' => '', // required
  'name' => '', //name will set from id if empty
  'options' => '', // Options for select, array
  'desc_tip' => '',
  'custom_attributes' => '', // array of attributes 
  'description' => ''
);

woocommerce_wp_select( $args );

tab_action.php

<?php

add_action( 'woocommerce_product_write_panel_tabs', 'my_custom_tab_action' );

/**
* Adding a custom tab
*/
function my_custom_tab_action() {
  ?>
  <li class="custom_tab">
    <a href="#the_custom_panel">
      <span><?php _e( 'My Custom Tab', 'textdomain' ); ?></span>
    </a>
  </li>
  <?php
}

tab_filter.php

<?php

add_filter( 'woocommerce_product_data_tabs', 'my_custom_tab' );
/**
* Adding a custom tab
*/
function my_custom_tab( $tabs ) {
  
  $tabs['custom_tab'] = array(
    'label'  => __( 'My Custom Tab', 'textdomain' ),
    'target' => 'the_custom_panel',
    'class'  => array(),
  );
  
  return $tabs;
}

tab_panel.php

<?php

add_action( 'woocommerce_product_data_panels', 'custom_tab_panel' );

function custom_tab_panel() {
  ?>
  <div id="the_custom_panel" class="panel woocommerce_options_panel">
    <div class="options_group">
      <?php  
        $field = array(
          'id' => 'my_custom_input',
          'label' => __( 'Custom Input', 'textdomain' ),
        );

        woocommerce_wp_text_input( $field );
      ?>
    </div>
  </div>
<?php
}

text_input.php

<?php

$args = array(
  'label' => '', // Text in Label
  'placeholder' => '',
  'class' => '',
  'style' => '',
  'wrapper_class' => '',
  'value' => '', // if empty, retrieved from post meta where id is the meta_key
  'id' => '', // required
  'name' => '', //name will set from id if empty
  'type' => '',
  'desc_tip' => '',
  'data_type' => '',
  'custom_attributes' => '', // array of attributes 
  'description' => ''
);

woocommerce_wp_text_input( $args );

textarea_input.php

<?php

$args = array(
  'label' => '', // Text in Label
  'placeholder' => '',
  'class' => '',
  'style' => '',
  'wrapper_class' => '',
  'value' => '', // if empty, retrieved from post meta where id is the meta_key
  'id' => '', // required
  'name' => '', //name will set from id if empty
  'rows' => '',
  'cols' => '',
  'desc_tip' => '',
  'custom_attributes' => '', // array of attributes 
  'description' => ''
);

woocommerce_wp_textarea_input( $args );