predisHow can I use the zscan command in PHP with Redis?
The zscan
command in Redis can be used in PHP to iterate over elements in a sorted set. It returns a cursor which can be used to iterate over the elements in the sorted set.
Example code
<?php
// Connect to Redis
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
// Get the first cursor
$cursor = 0;
$elements = $redis->zscan('sorted_set', $cursor);
$cursor = $elements[0];
// Iterate over the elements
while ($cursor != 0) {
$elements = $redis->zscan('sorted_set', $cursor);
foreach ($elements[1] as $key => $value) {
echo "$key => $value\n";
}
$cursor = $elements[0];
}
?>
Output example
element1 => 5
element2 => 9
element3 => 1
This code will connect to a Redis server, get the first cursor of the sorted set, and iterate over the elements of the sorted set using the zscan
command. For each element, it will print out the key and value to the screen.
Code explanation
- Connect to Redis:
$redis = new Redis(); $redis->connect('127.0.0.1', 6379);
- Get first cursor:
$cursor = 0; $elements = $redis->zscan('sorted_set', $cursor); $cursor = $elements[0];
- Iterate over elements:
while ($cursor != 0) { ... }
- Print out key and value:
echo "$key => $value\n";
Helpful links
More of Predis
- How can I troubleshoot a "PHP Redis went away" error?
- How can I use PHP and Redis to retrieve a range of values from a sorted set?
- How can I use Redis with the Yii PHP framework?
- How can I use PHP to increment values in Redis using ZINCRBY?
- How can I use PHP and Redis to retrieve data from a sorted set using ZRANGEBYSCORE?
- How do I install and configure a PHP Redis DLL on a Windows machine?
- How can I install and configure PHP and Redis on a Windows system?
- How can I check the version of PHP and Redis I am using?
- How do I install PHP Redis on Ubuntu 20.04?
- How can I use the PHP Redis HGET command?
See more codes...