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This article introduces the knowledge of "how to use the scan of php redis". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

When deleting the cache, we need to delete it in batch in some scenarios, but we are not sure the specific key value. We can query it by matching and delete it.

However, using keys can cause the redis server to go down. Use it cautiously.

In general, companies will also disable more sensitive commands such as keys. [related recommendation: Redis video tutorial]

So the scan command is used to match the query at work.

SCAN cursor [MATCH pattern] [COUNT count]

such as

# scan key values that match test1:* from cursor 0, scanning 1000 scan 0 match test1:* count 1000 at a time

1) represents the cursor value for the next scan, and the command line displays a string type. 2) indicates the list of key values matched by this scan

How to implement it with php code, for example

Function getKeysByPattern ($pattern) {$keysList = []; while (true) {/ / @ todo replace the client here with your own redis client object $keys = $client- > scan ($iterator, $pattern,1000); $keysList = array_merge ($keysList, $keys?? []); if ($iterator = 0) {/ / iteration ended and no key break matching pattern was found } if ($iterator = null) {/ / "cursor is null, reset to 0, continue to scan" $iterator = "0";}} $keysList = array_unique ($keysList); return keysList;} "how to use scan for php redis" ends here. Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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