Super-lightweight Redis client

redis.php

<?php

  /**
   * Super-lightweight Redis client
   *
   * @param resource $sock
   * @param string $cmd
   * @return bool|int|string
   */
  function redis_cmd($sock, $cmd)
  {
    $args = explode(' ', $cmd);
    foreach($args as $i => $arg) {
      $args[$i] = sprintf("$%d\r\n%s", strlen($arg), $arg);
    }
    $cmd = sprintf("*%d\r\n%s\r\n",count($args), implode("\r\n", $args));
    if( ! fwrite($sock, $cmd)) {
      return FALSE;
    }
    $reply = fgets($sock);
    if($reply === FALSE) {
      return FALSE;
    }
    $reply = rtrim($reply, "\r\n");
    $replyType = substr($reply, 0, 1);
    switch ($replyType) {
        case '-':
        case '*': // Not supported
          return FALSE;
        case ':':
          return intval(substr($reply, 1));
        case '+':
          return substr($reply, 1);
        case '$':
          if ($reply == '$-1') return FALSE;
          $size = (int) substr($reply, 1);
          $response = stream_get_contents($sock, $size + 2);
          if( ! $response)
            return FALSE;
          return substr($response, 0, $size);
        default:
          return FALSE;
    }
  }