How can the issue of "Undefined offset" be resolved in PHP code that involves iterating over session values?

When iterating over session values in PHP, the "Undefined offset" issue can occur when trying to access an index that does not exist in the session array. To resolve this, you can check if the index exists before trying to access it. This can be done using the isset() function to ensure that the index is set in the session array before accessing it. 

session_start();

if(isset($_SESSION['my_array'])) {
    $myArray = $_SESSION['my_array'];
    
    foreach($myArray as $key => $value) {
        // Access $key and $value here
    }
}

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