PHP Redis: Get All Keys Starting With (Detailed Guide w/ Code Examples)

Use Case(s)

In PHP with a Redis database, you often need to retrieve all keys that start with a specific prefix. This is useful in situations where you want to group related keys together or for debugging purposes.

Code Examples

Here's an example showing how to use the KEYS command in PHP with Redis:

$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
$keys = $redis->keys('prefix*');
print_r($keys);

In this example, we're connecting to a local Redis instance and then using the keys method with 'prefix*' as an argument. This will return an array of all keys that start with 'prefix'.

Best Practices

Although the KEYS command is very helpful, it should be used sparingly in a production environment because it can potentially block the server while it executes. If you need to regularly find keys by pattern in a production setting, consider maintaining a separate set of keys yourself.

Common Mistakes

A common mistake when using the KEYS command is not realizing that it scans the entire key space. This can lead to performance problems if your Redis instance contains a large number of keys.

FAQs

Q: Can I use other patterns with the KEYS command? A: Yes, the KEYS command accepts any glob-style pattern supported by Redis.