#WordPress enqueue scripts/styles by custom fields

customfield_scripts_styles.php

<?php
/*
Plugin Name: Customfield Add Header
Author: Takuro Hishikawa
Version: 0.1
*/

function customfield_scripts_styles(){
    if ( is_singular() ) {
        $post = get_post();
        if ( is_a( $post, 'WP_Post' ) ) {

            $custom_scripts = get_post_meta( $post->ID, 'custom_scripts', false );
            $queue_id = 0;
            foreach ( (array) $custom_scripts as $custom_script ) {
                wp_enqueue_script( 'custom-script-'.$post->ID.'-'.$queue_id, $custom_script );
                $queue_id++;
            }

            $custom_styles = get_post_meta( $post->ID, 'custom_styles', false );
            $queue_id = 0;
            foreach ( (array) $custom_styles as $custom_style ) {
                wp_enqueue_style( 'custom-style-'.$post->ID.'-'.$queue_id, $custom_style );
                $queue_id++;
            }
        }
    }
}
add_action( 'wp_enqueue_scripts', 'customfield_scripts_styles' );