How to resolve 'undefined index in php'?

Example:

$data = array('name' => 'John');
echo $data['age'];

Attempting to access an array index that doesn't exist.

Solution:

You should always check if an array key exists before trying to access it. This avoids potential warnings or errors.


if(isset($data['age'])) {
    echo $data['age'];
}

Beginner's Guide to PHP