By using phpredis , I have saved some data in pagination like this:
review/itemA/1
review/itemA/2
where 1
and 2
are page numbers. I read in the document that you can use wildcards to retrieve multiple keys.
$allKeys = $redis->keys('*'); // all keys will match this.
$keyWithUserPrefix = $redis->keys('user*');
But can I delete all the old keys using wildcards as well when someone has posted a new review? Can I do something like:
$redis->delete('review/itemA/*'); // or $redis->delete('review/itemA*')
It didn't work however.
No - Redis' DEL
lete does not accept wildcards, you have to name the keys explicitly. See here for possible directions: https://stackoverflow.com/a/23399125/3160475
When using phpredis
, you can get the prefix (which phpredis automatically prepends everywhere) and delete a pattern of keys that way :
<?php
...
$prefix = $redisClient->getOption(Redis::OPT_PREFIX);
$redisClient->delete(array_map(
function ($key) use ($prefix) {
return str_replace($prefix, '', $key);
}, $redisClient->keys('*'))
);
$bash = 'redis-cli --scan --pattern "' . $path . '*" | xargs -L 1000 redis-cli DEL';
$res = @shell_exec($bash);
I just use
$redis->delete($redis->keys('*'));
It's works fine for me.
Predis ( ->del
) allows to pass a keys array too.
It works here and is faster than the del
inside the foreach
.
$prefix = $this->client->getOptions($this->OPT_PREFIX);
$keys = $this->client->keys("$key*");
if ($keys) $this->client->del($keys);
With Predis , I do it like this:
public function delete($key) {
$keys = $this->client->keys($key);
foreach ($keys as $key) {
$this->client->del($key);
}
}
There is no wildcard for delete function . workaround as follows,
// returns total number of keys deleted
function delete($key) {
if (empty($key)) { // empty key can delete all
return false;
}
$keys = $redis->keys("$key*"); // keys() function returns array of key strings. `*` wild card pattern can be changed as per need
if(!$keys) {
return 0;
}
$prefix = $redis->getOption(\Redis::OPT_PREFIX); // keys already have prefix, so we clear until delete finish.
$redis->setOption(\Redis::OPT_PREFIX, '');
$count = $redis->del($keys); // del() function delete array of keys and returns number of keys deleted.
$redis->setOption(\Redis::OPT_PREFIX, $prefix);
return $count;
}
Note: As @Akash Gangrade commented, keys() not advised to use due to performance. you can consider Tags based cache invalidation like https://symfony.com/doc/current/components/cache/cache_invalidation.html#tag-aware-adapters
# The keys set in redis
/*
1) "review/itemA/5"
2) "review/itemA/2"
3) "review/itemA/3"
4) "review/itemA/1"
5) "review/itemA/4"
*/
/**
* Vars for scan
*/
$i = null;
$result = [];
/**
* Scan redis using desired pattern
*/
while ($result != 0) {
$result = $redis->scan($i, 'review/itemA/*');
if (!empty($result)) {
$all_keys[] = $result;
}
}
# Use call_user_func_array to flatten multidimensional array into indexed array
## Scan may return duplicate keys, so use array_unique
$unlink_keys = array_unique(call_user_func_array('array_merge', $all_keys));
# As of Redis 4.0 use unlink instead of del to stop blocking
$redis->unlink($unlink_keys);
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