List All Key/Value Pairs in Redis using the Predis Library. Assumes that Redis is running locally on default port 6379 with no password auth

allkeys.php

<?
//Include Predis library. See https://github.com/nrk/predis for more info
require "Predis/Autoloader.php";

//Connect to Redis
Predis\Autoloader::register();
try {
	$redis = new Predis\Client();
	$redis = new Predis\Client(array(
		"scheme" => "tcp",
		"host" => "127.0.0.1"))
	;
}
catch (Exception $e) {
	echo "Couldn't connect to Redis";
	echo $e->getMessage();
}

//Get list of all keys. This creates an array of keys from the redis-cli output of "KEYS *"
$list = $redis->keys("*");

//Optional: Sort Keys alphabetically
sort($list);

//Loop through list of keys
foreach ($list as $key)
{
	//Get Value of Key from Redis
	$value = $redis->get($key);
	
	//Print Key/value Pairs
	echo "<b>Key:</b> $key <br /><b>Value:</b> $value <br /><br />";
}

//Disconnect from Redis
$redis->disconnect();

?>

While this works and is a correct solution,
just keep in mind that some cloud Redis options do not support the "key *" command - as it is very expensive.

A workaround to this is described here:

• https://stackoverflow.com/questions/28545549/how-to-use-scan-with-the-match-option-in-predis
• https://csil-git1.cs.surrey.sfu.ca/djh10/group1/blob/master/vendor/predis/predis/examples/RedisCollectionsIterators.php

use Predis\Collection\Iterator;

$client = ...;
$pattern = 'foo*';

foreach (new Iterator\Keyspace($client, $pattern) as $key) {
    ...
}