Quiet debug for expression/variable on shutdown (html commented)

quiet_debug.php

<?php

/**
 * Debug a expression/variable on shutdown with html comment
 * 
 * @param ...$args
 * @return void
 * */
function quiet_debug()
{
    $args = func_get_args();

    register_shutdown_function(function () use ($args) {

        $isCli = php_sapi_name() === 'cli';

        !$isCli && print '<!--' . PHP_EOL;

        foreach ($args as $arg) {
            is_scalar($arg) ? var_dump($arg) : print_r($arg);
        }

        !$isCli && print '-->' . PHP_EOL;
    });
}