### 签名生成规则 > 参数名按字典升序进行排序 > 参数名区分大小写 在排序后以URL键值(即：key1=value1&key2=value2)拼字符串，并在最后添加&key=xxxxx * * * #### PHP签名方式 ~~~ $query = [ 'app_id' => '你的app_id', 'biz_content' => json_encode($bizContent), 'version' => '1.0', 'method' => 'sms.message.send', 'sign_type' => 'md5', 'timestamp' => 1561860560738 //注意是毫秒 ]; ksort($query); $query['key'] = '你的开发者密钥'; $list = []; foreach ($query as $k => $v) $list[] = $k .'='.$v; $sign = strtoupper(md5(implode('&', $list))); ~~~