protected function normaliseEnvironmentVariable($name, $value)
{
list($name, $value) = $this->splitCompoundStringIntoParts($name, $value);
list($name, $value) = $this->sanitiseVariableName($name, $value);
list($name, $value) = $this->sanitiseVariableValue($name, $value);
$value = $this->resolveNestedVariables($value);
return array($name, $value);
}