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I think he is meaning in the session array, can he assign any of the following list of characters he mentioned to the array key or array value. Is that valid in php.
PHP validates all as long as you pass them as strings, I mean to say as long as you put your value in quotes it validates.
All the Characters he have used Can be used as
$_SESSION["<char>"] = "<char>";
except the |
If he Use $_SESSION["|"] = "|";
The Session variable will probably get set when the php script gets executed
After that when when someone wants to get the value of the session variable
The Compleate Session Will be erased