php variable session variables

Question

Can i set session variables based on the variable input into the function. Such as:

function check($value){
$_SESSION['$value'];
//session checks
}

Answer 1

Yes, but it would have to be $_SESSION[$value] . Single quoted strings are literal and do not have variable substitution (not that quotes are even needed in this case).

Answer 2

usually you would use a key and a value, depends what you're trying to do i guess and what $value is

function check($value){
  $_SESSION[$value] = $value;
  //session checks
}

Answer 3

做就是了：

$_SESSION[$value]