How can the session values be properly stored and accessed in PHP to avoid undefined offset errors?

To properly store and access session values in PHP to avoid undefined offset errors, make sure to check if the session value exists before trying to access it. This can be done using isset() or array_key_exists() functions to verify the existence of the key in the session array. 

// Check if the session value exists before accessing it
if(isset($_SESSION['key'])) {
    $value = $_SESSION['key'];
    // Use the session value
} else {
    // Handle the case when the session value is not set
}

Keywords

session values storage access undefined offset errors

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