How can the $_SERVER['REQUEST_URI'] be trimmed to avoid multiple versions in Google's index?

To avoid multiple versions of a URL being indexed by Google, you can trim the $_SERVER['REQUEST_URI'] to remove any unnecessary query parameters or trailing slashes. This will ensure that only the canonical version of the URL is indexed by search engines. 

$uri = strtok($_SERVER['REQUEST_URI'], '?');
$uri = rtrim($uri, '/');

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$_SERVER['REQUEST_URI'] trimming avoid multiple versions Google's index

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