How can the error "Notice: Undefined index" be resolved in PHP scripts?

The error "Notice: Undefined index" occurs when trying to access an array element that does not exist. To resolve this issue, you can use the isset() function to check if the index exists before accessing it. This will prevent the error from being triggered. 

if(isset($_POST['submit'])){
    $username = isset($_POST['username']) ? $_POST['username'] : '';
    $password = isset($_POST['password']) ? $_POST['password'] : '';
    
    // Rest of the code here
}

Keywords

Undefined index PHP error handling isset function array indexing

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