WordPress - Pass PHP values into JS

wp-pass-php-into-js.php

<?php

add_action( 'wp_enqueue_scripts', function() {
    $version = SCRIPT_DEBUG ? time() : null;
    wp_enqueue_script( 
        '_my_js_app', 
        get_template_directory_uri() . '/_my_js_app.js', 
        [],
        $version, 
        true // in footer.
    );

    /**
     * Pass our variables into our JS.
     * @see https://codex.wordpress.org/Function_Reference/wp_localize_script
     */
    wp_localize_script(
        '_my_js_app',
        'my_theme_data',
        [
            'nonce'             => wp_create_nonce( 'wp_rest' ),
            'path'              => $path,
            'blogname'          => get_option( 'blogname' ),
            'blogdescription'   => get_option( 'blogdescription' ),
            'posts_per_page'    => get_option( 'posts_per_page' ),
            'URL'               => array(
                'api'  => esc_url_raw( get_rest_url( null, '/wp/v2' ) ),
                'root' => esc_url_raw( $url ),
            ),
            'user_id'           => get_current_user_id(),
            'user_email'        => wp_get_current_user()->user_email,
            'any_other_php_var' => 'value from php for js here',
        ]
    ); 
} );