add-custom-text-field.php

<?php
/**
 * Add a custom text input field to the product page
 */
function plugin_republic_add_text_field() { ?>
  <div class="pr-field-wrap">
    <label for="pr-field"><?php _e( 'Your name', 'plugin-republic' ); ?></label>
    <input type="text" name='pr-field' id='pr-field' value=''>
  </div>
<?php }
add_action( 'woocommerce_before_add_to_cart_button', 'plugin_republic_add_text_field' );