What best practice should be followed to avoid the "Notice: Undefined index" error in PHP?

The "Notice: Undefined index" error in PHP occurs when trying to access an array element that does not exist. To avoid this error, it is recommended to check if the index exists before trying to access it using isset() or array_key_exists() functions. 

// Check if the index exists before accessing it
if(isset($array['index'])) {
    // Access the index if it exists
    $value = $array['index'];
} else {
    // Handle the case when the index does not exist
    $value = null;
}

Keywords

PHP error handling isset function array_key_exists function strict typing

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