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You can delete a session value from a session variable using the unset() function in PHP. Here is an example:

session_start(); // start the session

// set a session variable
$_SESSION['username'] = 'johnsmith';

// delete the session value
unset($_SESSION['username']);

In this example, the session variable "username" is set to "johnsmith". The unset() function is then used to delete the "username" value from the session variable.