Send PHP variables to script JS

send_php_to_js.php

<?php
/**
 * Send php variables to js
 * @package LetsGodev\MuPlugins
 * @since 1.0
 * @description : use letsgo_vars.ajax_url in script js
 */

add_action( 'wp_enqueue_scripts', 'sendVarsToScripts' );

/**
 * Send php variables to js
 * @return void
 */
function sendVarsToScripts(): void {
	
	// Register a JS script
	wp_register_script(
		'letsgo-js',
		plugins_url( 'resources/assets/scripts/letsgo.js', __FILE__ ),
		[ 'jquery' ],
		wp_get_wp_version(),
		[ 'in_footer' => true ]
	);
	
	// Include a JS script
	wp_enqueue_script( 'letsgo-js' );
	
	// Send PHP
	wp_localize_script( 'letsgo-js', 'letsgo_vars', [
		'ajax_url'   => admin_url( 'admin-ajax.php' ),
		'ajax_nonce' => wp_create_nonce( 'letsgo-nonce' ),
		'site_url'   => get_site_url(),
	] );
	
}