<?php  
session_start();  
header("Content-type:text/html; charset=UTF-8");  
  
function https_request($url)  
    {  
    $curl = curl_init();  
    curl_setopt($curl, CURLOPT_URL, $url);  
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);  
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);  
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);  
    $data = curl_exec($curl);  
    if (curl_errno($curl)) {return 'ERROR '.curl_error($curl);}  
    curl_close($curl);  
    return $data;  
    }  
function xml_to_array($xml){  
    $reg = "/<(\w+)[^>]*>([\\x00-\\xFF]*)<\\/\\1>/";  
    if(preg_match_all($reg, $xml, $matches)){  
        $count = count($matches[0]);  
        for($i = 0; $i < $count; $i++){  
        $subxml= $matches[2][$i];  
        $key = $matches[1][$i];  
            if(preg_match( $reg, $subxml )){  
                $arr[$key] = xml_to_array( $subxml );  
            }else{  
                $arr[$key] = $subxml;  
            }  
        }  
    }  
    return @$arr;  
}  

if(empty($mobile)){  
    //exit('手机号码不能为空');  
}  
  
if(empty($_SESSION['send_code']) or $send_code!=$_SESSION['send_code']){  
    //防用户恶意请求  
    //exit('请求超时，请刷新页面后重试');  
}  
  
function percentEncode($str)  
{  
    // 使用urlencode编码后，将"+","*","%7E"做替换即满足ECS API规定的编码规范  
    $res = urlencode($str);  
    $res = preg_replace('/\+/', '%20', $res);  
    $res = preg_replace('/\*/', '%2A', $res);  
    $res = preg_replace('/%7E/', '~', $res);  
    return $res;  
}  

function computeSignature($parameters, $accessKeySecret)  
{  
    // 将参数Key按字典顺序排序  
    ksort($parameters);  
    // 生成规范化请求字符串  
    $canonicalizedQueryString = '';  
    foreach($parameters as $key => $value)  
    {  
    $canonicalizedQueryString .= '&' . percentEncode($key)  
        . '=' . percentEncode($value);  
    }  
    // 生成用于计算签名的字符串 stringToSign  
    $stringToSign = 'GET&%2F&' . percentencode(substr($canonicalizedQueryString, 1));  
    //echo "<br>".$stringToSign."<br>";  
    // 计算签名，注意accessKeySecret后面要加上字符'&'  
    $signature = base64_encode(hash_hmac('sha1', $stringToSign, $accessKeySecret . '&', true));  
    return $signature;  
}  
// 注意使用GMT时间  
date_default_timezone_set("GMT");  
$target = "https://dysmsapi.aliyuncs.com/?";  
$dateTimeFormat = 'Y-m-d\TH:i:s\Z'; // ISO8601规范  
$accessKeyId = 'XXXXXXXX';      // 这里填写您的Access Key ID  
$accessKeySecret = 'XXXXXXXXXXXXXXXXX';  // 这里填写您的Access Key Secret  
$ParamString="{\"XXName\":\"test\",\"XXXXType\":\"test\"}";  

$data = array(  
    'AccessKeyId' => $accessKeyId,
    'Action' => 'SendSms',
    'Format' => 'XML', 
    'OutId' => '123', 
    'PhoneNumbers' => '183XXXXXXXX',
    'RegionId' => 'cn-hangzhou',
    'SignName'=>'XXXX电子商务有限公司',
    'SignatureMethod' => 'HMAC-SHA1',
    'SignatureNonce'=> uniqid(),
    'SignatureVersion' => '1.0',
    'TemplateCode' => 'SMS_9705XXXX', 
    'TemplateParam' => $ParamString,
    'Timestamp' => date($dateTimeFormat),
    'Version' => '2017-05-25'
);  
// 计算签名并把签名结果加入请求参数  
$data['Signature'] = computeSignature($data, $accessKeySecret);  
// 发送请求     
    $result = xml_to_array(https_request($target.http_build_query($data)));  
    echo $result['Error']['Code']."--->".$result['Error']['Message']; 
    echo "<br><br>".$target . http_build_query($data);  
?>

用post方式访问只需要改三处：
1、将computeSignature函数内的拼接字符GET改成POST

 // 生成用于计算签名的字符串 stringToSign  
$stringToSign = 'POST&%2F&' . percentencode(substr($canonicalizedQueryString, 1));  

2、将发送http请求的PHP函数https_request改为用POST方式传：

   function https_request($url)  
{  
    $curl = curl_init();
    //设置抓取的url
    curl_setopt($curl, CURLOPT_URL, 'https://dysmsapi.aliyuncs.com');
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);  
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
    //设置头文件的信息作为数据流输出
    curl_setopt($curl, CURLOPT_HEADER, 1);
    //设置获取的信息以文件流的形式返回，而不是直接输出。
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    //设置post方式提交
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $url);
    $data = curl_exec($curl);  
    if (curl_errno($curl)) {return 'ERROR '.curl_error($curl);}  
    curl_close($curl);  
    return $data;  
}  

3、调用https_request的参数需要调整为POST要传输的值

$result = xml_to_array(https_request(http_build_query($data)));  

DONE！