add meta box with input field repeater wordpress

meta-box-filed-repeater.php

<?php
/**
 * Create custom meta box 
 */
 
// code is taken from stackoverflow and did some changes as per requirements.

add_action( 'add_meta_boxes', 'dynamic_add_box' );

/* Do something with the data entered */
add_action( 'save_post', 'dynamic_save_postdata' );

/* Adds a box to the main column on the Post and Page edit screens */
function dynamic_add_box() {
    add_meta_box(
        'review_meta_box_id', // custom id unique
        __( 'Questionnaire Options', 'hb_review_rating' ),
        'dynamic_inner_custom_box', // calback function
        'review_questionnaire'); // post name ( array )
}

/* Prints the box content */
function dynamic_inner_custom_box() {
    global $post;
    // Use nonce for verification
    wp_nonce_field( plugin_basename( __FILE__ ), 'questionnaire_noncename' );
    ?>
    <div id="meta_inner">
    <?php

    //get the saved meta as an array
    $question_options = get_post_meta($post->ID,'review_questionnaireOptions', true);
    $c = 0;
    if ( count($question_options) > 0  && !empty($question_options)) {
        foreach( $question_options as $options ) {
            if ( isset( $options['option'] ) || isset( $options['star'] ) ) {
                printf( '<p>Option Name <input type="text" name="question_options[%1$s][option]" value="%2$s" /> -- Star number : <input type="text" name="question_options[%1$s][star]" value="%3$s" /><button class="optionsRemove dashicons-before dashicons-trash" title="%4$s"></button></p>', $c, $options['option'], $options['star'], __( 'Remove Option' ) );
                $c = $c +1;
            }
        }
    }

    ?>
<span id="hb_options_wrapper"></span>
<button class="optionsAdd dashicons-before dashicons-plus-alt" title="<?php _e('Add Options'); ?>"><?php _e('Add Options'); ?></button>
      // move script to particular js file
<script>
    var $ =jQuery.noConflict();
    $(document).ready(function() {
        var count = <?php echo $c; ?>;
        $(".optionsAdd").click(function() {
            count = count + 1;
          // i hate append will update it soon
            $('#hb_options_wrapper').append('<p>Option Name <input type="text" name="question_options['+count+'][option]" value="" /> -- Star number : <input type="text" name="question_options['+count+'][star]" value="" /><button class="optionsRemove dashicons-before dashicons-trash" title="<?php _e('Add Options'); ?>"></button></p>' );
            return false;
        });
      // using .live as per jquery current version in project 
        $(".optionsRemove").live('click', function() {
            $(this).parent().remove();
        });
    });
    </script>
</div><?php

}

/* When the post is saved, saves our custom data */
function dynamic_save_postdata( $post_id ) {

    // verify if this is an auto save routine. 
    // If it is our form has not been submitted, so we dont want to do anything
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) 
        return;

    // verify this came from the our screen and with proper authorization,
    // because save_post can be triggered at other times
    if ( !isset( $_POST['questionnaire_noncename'] ) )
        return;

    if ( !wp_verify_nonce( $_POST['questionnaire_noncename'], plugin_basename( __FILE__ ) ) )
        return;

    // OK, we're authenticated: we need to find and save the data

    $question_options = $_POST['question_options'];
    update_post_meta($post_id,'review_questionnaireOptions',$question_options);
}