PHP and Vue.js develop applications that defend against SQL injection attacks

PHP and Vue.js develop applications that defend against SQL injection attacks

Introduction:
With the development of the Internet, network security issues have become increasingly prominent. Among them, SQL injection attack is a common and dangerous attack method. When the application code does not adequately filter user input, hackers can obtain or modify data in the database through maliciously constructed SQL statements. In order to ensure the security of the application, this article will introduce how to combine PHP and Vue.js to develop an application that defends against SQL injection attacks, and attach corresponding code examples.

1. PHP back-end defense against SQL injection attacks

1. Input filtering and verification
   In order to prevent users from entering malicious SQL statements, we can use PHP’s built-in functions to filter the input Perform filtering and validation. The following are some commonly used functions and methods:

• mysqli_real_escape_string(): Escape special characters and turn them into safe strings. For example:

$username = mysqli_real_escape_string($connection, $_POST['username']);

• intval(): Force the input to an integer. For example:

$id = intval($_GET['id']);

• Regular expression: Validate and filter the input data by using regular expressions to ensure that only legal characters and formats are allowed. For example:

if (preg_match('/^[wd_]+$/', $username)) {
    // 符合格式要求
} else {
    // 格式不正确
}

2. Use prepared statements
   Prepared statements are an effective method to prevent SQL injection attacks. By declaring SQL query statements in advance and separating user-entered parameters from the query statements, malicious injection can be effectively prevented. The following is an example of using prepared statements:

$stmt = $connection->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $username);
$stmt->execute();
$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    // 处理查询结果
}

2. Vue.js front-end defense against SQL injection attacks

1. Use v-bind to bind properties
   In In Vue.js, you can use the v-bind directive to bind the attributes of a DOM element. At this time, Vue.js will escape the bound attributes to prevent XSS attacks. For example:

<input v-bind:value="inputData">

2. Filtering and escaping data
   In Vue.js, you can use filters to process data to ensure that the input data conforms to the expected format. The following is an example of using filters:

<input v-model="inputData | filterXSS">

Vue.filter('filterXSS', function (value) {
    // 过滤和转义value
    return filteredValue;
});

3. Front-end data validation
   In addition to using filters, we can also validate user input to ensure that only legal data is allowed to be passed. For backend processing. For example, you can use Vue.js's instructions and methods to validate user-entered data before submitting a form:

<form v-if="isValid" @submit="submitData">
    <!-- 表单内容 -->
    <button type="submit">提交</button>
</form>

{
    data() {
        return {
            isValid: false
        }
    },
    methods: {
        submitData() {
            // 提交数据到后端
        }
    },
    watch: {
        inputData: function (newVal) {
            // 验证数据是否合法
            if (newVal !== '') {
                this.isValid = true;
            } else {
                this.isValid = false;
            }
        }
    }
}

Conclusion:
This article introduces the use of PHP and Vue.js to develop defensive SQL Methods for injecting attacks into applications. Through reasonable input filtering, use of prepared statements, front-end attribute binding and filtering, data verification and other measures, SQL injection attacks can be effectively prevented. When developing and maintaining applications, it is important to remain security aware and keep vulnerabilities updated and patched. Only by comprehensively strengthening security can users' data security and application reliability be guaranteed.

The above is the entire content and sample code of this article. I hope it will be helpful to everyone in understanding and applying PHP and Vue.js to develop applications that defend against SQL injection attacks.

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