How can the Null Coalesce Operator in PHP 7 be used to handle unset POST variables more efficiently?

When dealing with unset POST variables in PHP, using the Null Coalesce Operator (??) can help handle them more efficiently. This operator checks if a variable is set and not null, and if it is, it returns that value. If the variable is unset or null, it returns a default value instead. This can prevent undefined index errors and make the code more robust. 

// Using the Null Coalesce Operator to handle unset POST variables
$username = $_POST['username'] ?? 'Guest';
$email = $_POST['email'] ?? '';

Keywords

Null Coalesce Operator PHP 7 POST variables unset efficiency

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