StackFormation\Diff::printDiff PHP Method

    protected function printDiff($stringA, $stringB)
    {
        if ($stringA === $stringB) {
            return 0;
            // that's what diff would return
        }
        $fileA = tempnam(sys_get_temp_dir(), 'sfn_a_');
        file_put_contents($fileA, $stringA);
        $fileB = tempnam(sys_get_temp_dir(), 'sfn_b_');
        file_put_contents($fileB, $stringB);
        $command = is_file('/usr/bin/colordiff') ? 'colordiff' : 'diff';
        $command .= " -u {$fileA} {$fileB}";
        passthru($command, $returnVar);
        unlink($fileA);
        unlink($fileB);
        return $returnVar;
    }