How to connect to Alibaba Cloud SMS sending interface through PHP to implement customer service notification function

<?php

/**
 * 发送短信
 * @param string $accessKeyId AccessKeyId
 * @param string $accessSecret AccessKeySecret
 * @param string $phoneNumbers 手机号码
 * @param string $signName 短信签名
 * @param string $templateCode 短信模板Code
 * @param array $templateParam 短信模板变量
 * @return bool|string
 */
function sendSms($accessKeyId, $accessSecret, $phoneNumbers, $signName, $templateCode, $templateParam)
{
    $params = array(
        'SignName' => $signName,
        'PhoneNumber' => $phoneNumbers,
        'TemplateCode' => $templateCode,
        'TemplateParam' => json_encode($templateParam),
        'AccessKeyId' => $accessKeyId,
        'Timestamp' => gmdate("Y-m-dTH:i:sZ"),
        'Format' => 'JSON',
        'SignatureMethod' => 'HMAC-SHA1',
        'SignatureVersion' => '1.0',
        'SignatureNonce' => uniqid(),
        'Action' => 'SendSms',
        'Version' => '2017-05-25',
    );

    ksort($params);

    $accessSecret .= '&';
    $url = 'http://dysmsapi.aliyuncs.com/?';

    foreach ($params as $key => $value) {
        $url .= "$key=" . urlencode($value) . '&';
    }

    $url = substr($url, 0, -1);

    $sign = base64_encode(hash_hmac('sha1', $url, $accessSecret, true));
    $signature = urlencode($sign);

    $url .= "&Signature={$signature}";

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
}

// 使用示例
$accessKeyId = '您的AccessKeyId';
$accessSecret = '您的AccessKeySecret';
$phoneNumbers = '手机号码';
$signName = '短信签名';
$templateCode = '短信模板Code';
$templateParam = array(
    'code' => '验证码'
);

$result = sendSms($accessKeyId, $accessSecret, $phoneNumbers, $signName, $templateCode, $templateParam);

// 打印短信发送结果
if($result) {
    $result = json_decode($result, true);
    if(isset($result['Code']) && $result['Code'] == 'OK') {
        echo '短信发送成功';
    } else {
        echo '短信发送失败';
    }
} else {
    echo '短信发送失败';
}