ZCE Zend Certified Engineer String Append Prepend question answer

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function stringAppend($str)
{
$str = $str."append";
}
function stringPrepend($str)
{
$str = "prepend".$str;
}

$aString = "PHP";
echo stringPrepend(stringAppend($aString));


Answer: NULL
Because aString is not passed by reference.