session_reset

(PHP 5 >= 5.6.0, PHP 7)

session_reset — Re-initialize session array with original values

说明

void session_reset ( void )

session_reset() reinitializes a session with original values stored in session storage. This function requires an active session and discards changes in $_SESSION.

返回值

没有返回值。

参见

User Contributed Notes

parsa dot mhn at outlook dot com 03-Sep-2015 05:14
First of all you should execute this code :
<?php
    session_start();
    $_SESSION["A"] = "Some Value";
?>

then you should execute this one :

<?php
    start_session();
    $_SESSION["A"] = "Some New Value";  // set new value

    session_reset();  // old session value restored
    echo $_SESSION["A"];

    //Output: Some Value
?>

That is because session_reset() is rolling back changes to the last saved session data, which is their values right after the session_start().
vijay dot mits at gmail dot com 21-Apr-2015 06:12
first create a session variable

<?php
    session_start();
    $_SESSION["A"] = "Some Value";
    echo $_SESSION["A"];

    //Output: Some Value

    //if you need to rollback the session values after seting new value to session variables use session_reset()

    $_SESSION["A"] = "Some New Value";  // set new value
   
    session_reset();  // old session value restored
    echo $_SESSION["A"];

    //Output: Some Value
?>