What is the significance of the error message "Undefined index: action" in the provided PHP script?

The error message "Undefined index: action" indicates that the script is trying to access an array key 'action' that does not exist in the $_POST or $_GET superglobal arrays. To solve this issue, you need to check if the 'action' key is set before accessing it to avoid the error. 

if(isset($_POST['action'])) {
    $action = $_POST['action'];
    // Rest of the code handling the action
} else {
    // Handle the case when 'action' is not set
}

Keywords

PHP error message Undefined index action script

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