FLUSH DB Redis simple PHP (stream socket client)

redis_flush_db.php

<?php

// config
$redis_host = getenv('REDIS_HOST') ?: '127.0.0.1';
$redis_port = getenv('REDIS_PORT') ?: '6379';
$redis_db = getenv('REDIS_DB_NAME') ?: '0';

// init
$redis_server = sprintf('%s:%d', $redis_host, $redis_port);
$redis_create_request = function ($args) {
    $cmd = '*' . count($args) . "\r\n";
    foreach ($args as $item) {
        $cmd .= '$' . strlen($item) . "\r\n" . $item . "\r\n";
    }

    return $cmd;
};

// connect to the Redis
$socket = stream_socket_client($redis_server);

// run command
fwrite($socket, $redis_create_request(['SELECT', $redis_db]));
fwrite($socket, $redis_create_request(['FLUSHDB']));
$cmd_result = fgets($socket);
fwrite('-' === substr($cmd_result, 0, 1) ? STDERR : STDOUT, $cmd_result . "\n");

// close connection to the Redis
fclose($socket);