An example explains how to use PHP to implement an SMS verification code function

In today's Internet era, SMS verification codes are widely used in identity verification scenarios such as various websites, applications, and mobile clients. This article will introduce how to use PHP to implement an SMS verification code function.

The implementation of the SMS verification code is divided into three steps: generating the SMS verification code, sending the SMS verification code to the user's mobile phone, and verifying whether the verification code entered by the user is correct.

Step 1: Generate SMS verification code

To generate SMS verification code, we need to use the rand() function in PHP to generate a 4-digit random number. Store this random number in the session so we can use it in a later step. The following is the code to generate random numbers:

<?php session_start();
$code = rand(1000,9999);
$_SESSION[&#39;code&#39;] = $code;
?>

Step 2: Send the SMS verification code to the user’s mobile phone

To send the SMS verification code to the user’s mobile phone, you need to use the API provided by the third-party SMS platform . In this article, we will use the SMS platform of China Mobile Internet Open Platform.

We need to register a developer account first, then create an application and obtain the Access Key and Access Secret for the application. Then, we use the curl function in PHP to send an API request to the China Mobile Internet Open Platform to send the SMS verification code to the user's mobile phone. The following is the code for sending SMS verification code:

<?php $appkey = &#39;你的 Access Key&#39;;
$appsecret = &#39;你的 Access Secret&#39;;
$code = $_SESSION[&#39;code&#39;];
$phone = &#39;用户手机号码&#39;;
$url = &#39;http://gw.api.open.mob.com/sms/sendmsg?appkey=&#39; . $appkey . &#39;&appsecret=&#39; . $appsecret . &#39;&mobile=&#39; . $phone . &#39;&msg=&#39; . urlencode(&#39;【签名】您的验证码为：&#39; . $code . &#39;，该验证码将在10分钟内失效。&#39;);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
$output = curl_exec($ch);
curl_close($ch);
?>

In the code, we first set the Access Key, Access Secret, user mobile phone number and SMS template. We then splice these parameters into the request URL and use the curl function to send the request to the SMS platform.

Step 3: Verify that the verification code entered by the user is correct

After the user receives the SMS verification code, enter it into the website or application for verification. We need to compare the verification code entered by the user with the verification code stored in the session. The following is the code to verify the SMS verification code:

<?php session_start();
$code = $_SESSION[&#39;code&#39;];
$input = $_POST[&#39;code&#39;];
if ($code == $input) {
    echo &#39;验证码正确&#39;;
} else {
    echo &#39;验证码错误&#39;;
}
?>

In this code, we first obtain the verification code stored in the session and the verification code entered by the user. If the two verification codes are equal, it means that the verification code entered by the user is correct.

Summary

This article introduces how to use PHP to implement an SMS verification code function. We use the rand() function to generate random numbers, use the curl function to send the SMS verification code to the user's mobile phone, use the session to store the verification code, and use comparison operators to verify whether the verification code entered by the user is correct. SMS verification code is a simple, fast and effective identity verification method, which can effectively prevent malicious attacks and protect user privacy and security.

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