Predis - how to use array with zadd function?

Question

I've just started using Predis for Redis migration and I'm having trouble getting the zadd function to work with an array.

This code works:

foreach ($userIndexArr as $row) {
  $usernames[] = 0;
  $usernames[] = $row['username']; 
  $result = $this->cache->zadd('@person', 0, $row['username']);
}

This doesn't:

foreach ($userIndexArr as $row) {
  $usernames[] = 0;
  $usernames[] = $row['username']; 
}
try {
    $result = $this->cache->zadd('@person', $usernames);
} catch (Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "\n";
}

And no error is thrown. Any help is much appreciated!

-J

patrick · Answer 1 · 2016-05-30T20:14:27.473

I played around with this and if you're struggling with this the following example will surely help (following the redis.io documents example):

$predis->zadd( 'myset', [ "one" => 1, "uno" => 1, "two" => 2, "three" => 3 ] )

this will result in the same sorted set as on redis' example:

ZADD myzset 1 "one"
ZADD myzset 1 "uno"
ZADD myzset 2 "two" 3 "three"

tricky part of that if you want to do this in one line in Redis you would put the scores first, like so:

ZADD myzset 1 "one" 1 "uno" 2 "two" 3 "three"

in Predis, this would work as well:

$predis->zadd( 'myset', 1, "one", 1, "uno", 2, "two", 3, "three" );

score 3 · Answer 2 · answered Jan 27 '17 at 10:17

3

When using predis you must send the member as key and the score as value

$predis->zadd('your:table', array('member' => 'score');

for examples in redis docs it would be:

$predis->zadd('myzset', array('uno' => 1, 'two' => 2);

answered Jan 27 '17 at 10:17

Marius.C

700
6
14

score 0 · Answer 3 · answered Oct 22 '14 at 20:06

0

Try below, according to this source: https://github.com/nrk/predis/blob/v1.0/src/Command/ZSetAdd.php

foreach ($userIndexArr as $row) {
    $usernames[$row['username']] = 0; 
}
try {
    $result = $this->cache->zadd('@person', $usernames);
} catch (Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "\n";
}

Untested, though. But I think it works, as long as you're using v1.0 =)

answered Oct 22 '14 at 20:06

Niloct

9,491
3
44
57

I tried this but no luck. Still using the zadd in for loop. Is there a way to do this using execute raw? – jt_dylan Oct 26 '14 at 21:40
Check you Predis version, also issue a `MONITOR` in redis-cli to check what is the current command your code is sending. – Niloct Oct 27 '14 at 18:36
So, have you checked monitor command to see what's being output ? Also please tell me your Predis version. – Niloct Oct 31 '14 at 18:01
Hi, very sorry for the late reply. Had something a workaround so had to move on. Tried your code as is and it worked like a charm. Many thanks! – jt_dylan Apr 20 '15 at 23:55

Predis - how to use array with zadd function?

3 Answers3