gistfile1.php

<?php

use Symfony\Component\Process\ProcessBuilder,
    Symfony\Component\Process\ProcessUtils;

$builder = new ProcessBuilder;

$builder->setPrefix(['--argument-name', 'argument value']);

// after the ProcessUtils

$cmd = '"--argument-name" "argument value"';

// Why ? Because escapeshellarg escapes everything, no questions asked... Even the --argument-names (and -a)