Which is a valid start to a pho comment?

Which is a superglobal variable??

In PHP, the die() and exit() functions do the exact same thing.

What's the output? $a = true; var_dump($a);

What's the output? $array = array('dog','cat','pig'); $str = ' ' ; foreach($array as $value){ $value .= $value . $str; } print_r($array);;

What's the result of $b ? $a = 3; $b = &$a; $a = $a*4; echo $b;

What's the output sayHello($c);

Which variable is not related to file upload?

How do you connect mysql with the use of PHP5 new functions?

PHP provides the goto in the latest version.

What function allows you to find the position of the first occurrence of a substring?