Displaying pages in the program, how to implement the page paging method?
I am working on implementing an API for my project.
As I know there are various forms for pagination by results, for example:
https://example.com/api/purchaseorders?page=2&pagesize=25
But I see that many APIs like google take a different approach in which they use a "pageToken" so that the user can navigate between the results pages, for example:
https://example.com/api/purchaseorders?pagesize=25&pageToken=ClkKHgoRc291cmNlX2NyZWF0ZWRfYXQSCQjA67Si5sr
So page=2
they used instead pageToken=[token]
.
I don't understand the idea of pageToken and how to implement it.
It will be helpful if you guide me to any resources so that I can gain more knowledge.
Thank.
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Here is a very simple single example of using the file system as a keystore (since the file system will always be available).
$requestParameters = [];
if (($token = filter_input(INPUT_GET,"pageToken")) && is_readable("/tmp/$token")) {
$requestParameters = file_get_contents("/tmp/$token");
} else {
$requestParameters = [
"q" => filter_input(INPUT_GET,"q"),
"pageSize" => filter_input(INPUT_GET,"pageSize",FILTER_VALIDATE_INT),
"page" => filter_input(INPUT_GET,"page",FILTER_VALIDATE_INT)
];
}
$nextPageRequestParameters = $requestParameters;
$nextPageRequestParameters["page"]++;
$nextPageToken = md5(serialize($nextPageRequestParameters)); //This is not ideal but at least people can't guess it easily.
file_put_contents("/tmp/$nextPageToken", serialize($nextPageRequestParameters));
//Do request using $requestParameters
$result = [ "nextPageToken" => $nextPageToken, "data" => $resultData ];
echo json_encode($result);
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