Dynamic Css in Plugin

// make a php file inside inc/dynamic_css/dynamic_css.php
/* Then use in theme header
$dynamic_css_php = scandir(plugin_dir_path(__FILE__).'inc/dynamic_css');
if(in_array('dynamic_css.php',$dynamic_css_php)){
    require_once plugin_dir_path(__FILE__).'inc/dynamic_css/dynamic_css.php';
}
*/

function quick_start_dynamic_css_generate(){
    ob_start();
    $heading_color = get_theme_mod('heading_color');
    ?>
    h2.entry-title > a {
    color:<?php echo $heading_color; ?>
    }
    <?php
    file_put_contents( plugin_dir_path(dirname(__DIR__)).'inc/dynamic_css/dynamic_style.css',ob_get_clean());
}
add_action('wp_head','quick_start_dynamic_css_generate');

function quick_start_dynamic_css(){
    wp_enqueue_style('dynamic_css',plugin_dir_url(dirname(__DIR__)).'inc/dynamic_css/dynamic_style.css');
}
add_action('wp_enqueue_scripts','quick_start_dynamic_css');