How can string interpolation affect the accuracy of domain availability checks in PHP?

String interpolation can affect the accuracy of domain availability checks in PHP by potentially causing unintended characters or spaces to be included in the domain name being checked. This can lead to false positives or false negatives in the availability results. To solve this issue, it is recommended to use concatenation instead of string interpolation when constructing the domain name to be checked.

// Incorrect usage of string interpolation
$domain = "example.com";
$result = checkDomainAvailability("http://{$domain}");

// Correct usage of concatenation
$domain = "example.com";
$result = checkDomainAvailability("http://" . $domain);