How to write dynamic css in a php file in wordpress

How to write dynamic css in a php file in wordpress.php

<!-- functions.php -->
<?php

add_action( 'wp_enqueue_scripts', 'theme_custom_style_script', 11 );
function theme_custom_style_script() {
	wp_enqueue_style( 'dynamic-css', admin_url('admin-ajax.php').'?action=dynamic_css', '', VERSION);
}

add_action('wp_ajax_dynamic_css', 'dynamic_css');
add_action('wp_ajax_nopriv_dynamic_css', 'dynamic_css');
function dynamic_css() {
	require( get_template_directory().'/assets/css/custom.css.php' );
	exit;
}
?>



<!-- custm.css.php file -->
<?php
header( "Content-type: text/css; charset: UTF-8" );
global $lts;
?>

body{
	color: <?php echo $lts['base-color'] ?>;
}

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