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Zend Certified PHP Engineer Questions 81–85 (page: 18)

What is the output of the following code?
function append($str)
{
$str = $str.'append';
}
function prepend(&$str)
{
$str = 'prepend'.$str;
}
$string = 'zce';
append(prepend($string));
echo $string;

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

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

CORRECT TEXT
What is the output of the following code?
function increment ($val)
{
$_GET['m'] = (int) $_GET['m'] + 1;
}
$_GET['m'] = 1;
echo $_GET['m'];

How many times will the function counter() be executed in the following code?
function counter($start, &$stop)
{
if ($stop > $start)
{
return;
}
counter($start--, ++$stop);
}
$start = 5;
$stop = 2;
counter($start, $stop);