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Zend Certified PHP Engineer Questions 86–90 (page: 19)

How do you allow the caller to submit a variable number of arguments to a function?

What will the $array array contain at the end of this script?
function modifyArray (&$array)
{
foreach ($array as &$value)
{
$value = $value + 1;
}
$value = $value + 2;
}
$array = array (1, 2, 3);
modifyArray($array);

What is the output of the following code?
class a
{
public $val;
}
function renderVal (a $a)
{
if ($a) {
echo $a->val;
}
}
renderVal (null);

What is the output of the following code?
function fibonacci (&$x1 = 0, &$x2 = 1)
{
$result = $x1 + $x2;
$x1 = $x2;
$x2 = $result;
return $result;
}
for ($i = 0; $i < 10; $i++) {
echo fibonacci() . ', ';
}

What is the output of the following code?
function ratio ($x1 = 10, $x2)
{
if (isset ($x2)) {
return $x2 / $x1;
}
}
echo ratio (0);