How to achieve persistent storage and reading of data in PHP development

PHP is an extremely popular server-side scripting language that is widely used in web development. In PHP development, persistent storage and reading of data is a very critical issue. This article will introduce some common methods to achieve persistent storage and reading of data.

First of all, the most common way of persistent data storage is to use a relational database. MySQL is one of the most commonly used relational databases in PHP, and you can use the API it provides to operate the database.

To use the MySQL database, you first need to install MySQL on the server and create a database. Then, use appropriate functions in PHP code to connect to the database and execute SQL statements to store and read data.

The following is an example of using a MySQL database:

// 连接到数据库
$conn = mysqli_connect('localhost', 'username', 'password', 'dbname');

// 检查连接是否成功
if (!$conn) {
    die("连接数据库失败: " . mysqli_connect_error());
}

// 插入数据
$sql = "INSERT INTO users (name, age, email) VALUES ('John Doe', 25, 'johndoe@example.com')";
if (mysqli_query($conn, $sql)) {
    echo "数据插入成功";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}

// 读取数据
$sql = "SELECT * FROM users";
$result = mysqli_query($conn, $sql);

if (mysqli_num_rows($result) > 0) {
    // 输出每一行数据
    while($row = mysqli_fetch_assoc($result)) {
        echo "姓名: " . $row["name"]. " 年龄: " . $row["age"]. " 邮箱: " . $row["email"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 关闭数据库连接
mysqli_close($conn);

Another common method of persistent data storage is to use files. PHP provides a series of file operation functions that can easily store and read data.

The following is an example of using files to store data:

// 写入数据
$file = fopen("data.txt", "w");

fwrite($file, "John Doe,25,johndoe@example.com
");
fwrite($file, "Jane Smith,30,janesmith@example.com
");

fclose($file);

// 读取数据
$file = fopen("data.txt", "r");

while(!feof($file)){
    $line = fgets($file);
    $data = explode(",", $line);

    echo "姓名: " . $data[0] . " 年龄: " . $data[1] . " 邮箱: " . $data[2] . "<br>";
}

fclose($file);

In addition to relational databases and files, you can also use other methods such as NoSQL databases or key-value pair storage to achieve persistent storage of data. and read. It is very important to choose an appropriate data storage method based on actual needs and project characteristics.

In summary, there are many ways to choose from to achieve persistent storage and reading of data in PHP development, including relational databases, files, and NoSQL databases. Choose the appropriate way to store and read data based on project needs and actual conditions. By making full use of the database and file operation functions provided by PHP, you can easily achieve persistent storage and reading of data, providing stable and efficient data support for applications.

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