Detailed explanation of the configuration and usage of Redis cache by PHP

Using Redis as a cache service in PHP, you first need to make sure that your server has the Redis service installed and run, and then interact with Redis through the Redis extension of PHP. The following will introduce in detail how to configure Redis extensions and how to use Redis for caching operations in PHP projects.

Install Redis extension

Install Redis service: If you have not installed Redis, please visit the Redis official website to download and follow the official documentation to install and configure it.

Install the PHP Redis extension:

For Linux systems, Redis extensions can be installed through PECL. Open the terminal and enter the following command:

sudo pecl install redis

After the installation is complete, add a line to the file extension= to enable the extension.

Confirm the installation is successful: run php -m | grep redis or view the output information of phpinfo().

Configure Redis connection

In PHP code, you need to establish a connection to the Redis server first. Here is a basic connection configuration example:

<?php
// Redis server configuration$redisHost = '127.0.0.1'; // Redis server address$redisPort = 6379; // Redis service port$redisPassword = ''; // If Redis password is set, uncomment and fill in 
// Create Redis instance$redis = new Redis();
// Connect to Redis servertry {
    $redis->connect($redisHost, $redisPort, 1); // The last parameter is the connection timeout, unit to seconds    if ($redisPassword) {
        $redis->auth($redisPassword);
    }
    echo "Connected to Redis successfully.\n";
} catch (Exception $e) {
    echo "Connection failed: " . $e->getMessage() . "\n";
}
?>

Use Redis for cache operations

Once a connection with Redis is established, various cache operations can be performed, including but not limited to setting values, obtaining values, deleting keys, etc.

Set up cache

$key = 'example_key';
$value = 'This is an example value';
$ttl = 60; // cache expiration time, unit seconds 
// Set the string value directly$redis->set($key, $value);
 
// Set the value and specify the expiration time$redis->setex($key, $ttl, $value);

Get cache

$value = $redis->get($key);
if ($value !== false) {
    echo "Cached Value: " . $value . "\n";
} else {
    echo "Key '$key' not found in cache.\n";
}

Delete the cache

if ($redis->delete($key)) {
    echo "Key '$key' deleted successfully.\n";
} else {
    echo "Key '$key' was not found or could not be deleted.\n";
}

Determine whether the key exists

if ($redis->exists($key)) {
    echo "Key '$key' exists.\n";
} else {
    echo "Key '$key' does not exist.\n";
}

Advanced operations and data structures

Redis supports a variety of data structures, such as lists, collections, hash tables, etc. These can be operated through PHP's Redis extension to meet different cache needs.

List operation:

$redis->lpush('list_key', 'value1'); // Insert element to the left of the list$redis->rpop('list_key'); // Pop up and return to the element on the right side of the list

Collection operations:

$redis->sadd('set_key', 'member1', 'member2'); // Add members to the collection$redis->smembers('set_key'); // Get all members of the collection

Hash table operation:

$redis->hset('hash_key', 'field1', 'value1'); // Set the value of the hash table field$redis->hget('hash_key', 'field1'); // Get the value of the hash table field

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