PHP implements information addition-PHP Problem-php.cn

PHP implements information addition

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Release： 2023-05-06 14:46:08

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With the continuous development of the Internet, websites have become an important way for people to obtain and share information, so website development has become more and more important. In the development of websites, operations such as adding, modifying, and deleting information are often required. Here, we will introduce how to use PHP to implement the function of adding information.

1. Basic knowledge of PHP

Before using PHP to add information, you first need to understand some basic PHP knowledge:

1. Variables and data types: In PHP , variables can be declared with the $ symbol, and data types include integers, floating point types, Boolean types, strings, and arrays, etc.

2. Operators: PHP supports basic arithmetic operators (, -, *, /, %), comparison operators (==, !=, <, >, <=, > ;=), logical operators (&&, ||, !), assignment operators, etc.

3. Process control statements: PHP supports process control statements such as if, while, for, switch, etc., which are used to implement different programming logic.

4. Function: Function is an important concept in PHP. Through functions, some commonly used codes can be encapsulated to facilitate program design and calling.

2. The process of implementing the information adding function

The process of using PHP to implement the information adding function is as follows:

1. Create an HTML page: First you need to create an HTML page, use to enter information. HTML pages usually include form elements, text boxes, drop-down boxes, etc.

2. Get form data: When the user submits the form, you need to use PHP to get the form data. You can use $_POST, $_GET and other methods to get the form data.

3. Data verification: After obtaining the form data, the data needs to be verified to ensure that the data entered by the user complies with the regulations. Regular expressions, conditional judgments and other methods can be used for data verification.

4. Insert data into the database: After data verification, the data needs to be inserted into the database. Database operations can be performed using the MySQLi extension provided by PHP.

5. Determine whether the insertion is successful: After inserting data into the database, you need to determine whether the insertion is successful. This can be achieved by determining whether the result of the insert statement is true.

6. Output results: Finally, corresponding information needs to be output based on the insertion results to tell the user whether the data was successfully inserted or failed.

3. Code example for adding information using PHP

In order to better understand how to use PHP to add information, here is a PHP code example:

1. Create HTML page

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>信息添加页面</title>
</head>
<body>
    <form action="insert.php" method="post">
        名称：<input type="text" name="name"><br>
        年龄：<input type="text" name="age"><br>
        职业：
        <select name="job">
            <option value="工人">工人</option>
            <option value="教师">教师</option>
            <option value="医生">医生</option>
            <option value="程序员">程序员</option>
        </select>
        <br>
        <input type="submit" value="提交">
    </form>
</body>
</html></p>
<p>2. Obtain form data and data verification</p>
<pre class="brush:php;toolbar:false"><?php
    $name = $_POST['name'];
    $age = $_POST['age'];
    $job = $_POST['job'];

    // 数据验证
    if (empty($name)) {
        echo '请输入名称！';
        exit();
    }

    if (empty($age)) {
        echo '请输入年龄！';
        exit();
    }

    if (!is_numeric($age)) {
        echo '年龄必须是数字！';
        exit();
    }
?>

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3. Insert data into the database

<?php
    // 连接数据库
    $conn = new mysqli('localhost', 'root', '123456', 'test');

    // 检查连接状态
    if ($conn->connect_error) {
        die('数据库连接失败: ' . $conn->connect_error);
    }

    // 设置字符集
    $conn->set_charset('utf8');

    // 插入数据
    $sql = "INSERT INTO users (name, age, job) VALUES ('$name', '$age', '$job')";
    $result = $conn->query($sql);

    // 关闭连接
    $conn->close();
?>

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4. Determine whether the insertion is successful and output the result

<?php
    // 判断插入是否成功
    if ($result) {
        echo '信息添加成功！';
    } else {
        echo '信息添加失败！';
    }
?>

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In the above code example, you first need to save the HTML code as an insert.html file and the PHP code as an insert.php file. After completing the code writing, you can use the insert.html file as the entry file and enter the URL in the browser to access it.

In general, using PHP to implement the information adding function requires mastering certain basic knowledge of PHP and MySQL database operation knowledge. During the learning process, you can consult PHP official documentation and related books to better understand and master relevant knowledge.

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