session_is_registered
int session_is_registered(string variable_name) Checks for a variable in the session.
Returns:
TRUE if registered; FALSE on error
Description:
Checks whether a variable has been registered in the session and returns TRUE if it has been registered.
Version:
Existing since version 4.0
Example:
Check for variable in session
session_start();
if (!session_is_registered("counter")) {
$counter=10;
session_register("counter");
}
echo $counter;
$counter++;
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