QUESTION: 89

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() . ', ';
}

An error
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 2, 3, 5, 8, 13, 21, 34, 55,
Nothing

Answer(s): B

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QUESTION: 90

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

0
An integer overflow error
A warning, because $x1 is not set
A warning, because $x2 is not set
A floating-point overflow error
Nothing

Answer(s): D

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QUESTION: 91

Which of the following is NOT a valid function declaration?

function x ($x1 = array())
function x (A $x1)
function x (A $x1 = null)
function x ($x1 = $x2)

Answer(s): D

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QUESTION: 92

CORRECT TEXT
What is the output of the following code?
function increment (&$val)
{
return $val + 1;
}
$a = 1;
echo increment ($a);
echo increment ($a);

22

Answer(s): A

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