$data = [
  'touser' => '11111111111111111',
  'template_id' => '111111111111111111',
  'url' => '11111111111111111111',
  'data' => [
    'first' => [
      'value' => '1111111111111111111',
      'color' => '#173177',
    ],
    'keyword1' => [
      'value' => '111111111111111111',
      'color' => '#173177',
    ],
    'keyword2' => [
      'value' => date('Y年m月d日 H:i'),
      'color' => '#173177',
    ],
    'remark' => [
      'value' => '1111111111111111111111111',
      'color' => '#173177',
    ]
  ]
];
$access_token = '此处填写自己公众号的access_token';
$params = json_encode($data,JSON_UNESCAPED_UNICODE);
$start_time = microtime(true);
for ($i = 0; $i < 50; $i++) {
  $fp = fsockopen('api.weixin.qq.com', 80, $error, $errstr, 1);
  $http = "POST /cgi-bin/message/template/send?access_token={$access_token} HTTP/1.1\r\nHost: api.weixin.qq.com\r\nContent-type: application/x-www-form-urlencoded\r\nContent-Length: " . strlen($params) . "\r\nConnection:close\r\n\r\n$params\r\n\r\n";
  fwrite($fp, $http);
  fclose($fp);
}
print_r(microtime(true) - $start_time);