How to use PHP to implement data import and export functions

Title: PHP implements data import and export functions and code examples

Importing and exporting data is a very common function in Web development, it can help us Migrate data from one system to another, or export and save data to Excel, CSV and other formats. This article will introduce how to use PHP to implement data import and export functions, and provide specific code examples.

1. Data import function
Data import refers to importing external data into the system for processing and storage. The following is a sample code that uses PHP to import data:

<?php
// 定义数据库连接参数
$servername = "数据库服务器地址";
$username = "用户名";
$password = "密码";
$dbname = "数据库名称";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 获取导入的数据文件路径
$file_path = "数据文件路径";

// 打开文件，并逐行读取数据
$file = fopen($file_path, "r");
while (($line = fgets($file)) !== false) {
    // 解析每行数据，以逗号分隔
    $data = explode(",", $line);

    // 将数据插入数据库中的表
    $sql = "INSERT INTO 表名 (字段1, 字段2, 字段3) VALUES ('$data[0]', '$data[1]', '$data[2]')";
    if ($conn->query($sql) === true) {
        echo "数据插入成功！";
    } else {
        echo "数据插入失败：" . $conn->error;
    }
}

// 关闭文件和数据库连接
fclose($file);
$conn->close();
?>

In the above sample code, we first created a connection to the database through the mysqli class. Then open the data file through the fopen function, and read the data line by line using the fgets function. Use the explode function to parse each row of data into an array with commas as delimiters, then insert the data into the database, and finally close the file and database connection.

2. Data export function
Data export refers to exporting and saving data in the system into a specified format, such as Excel, CSV, etc. The following is a sample code that uses PHP to export data:

<?php
// 定义数据库连接参数
$servername = "数据库服务器地址";
$username = "用户名";
$password = "密码";
$dbname = "数据库名称";

// 创建数据库连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 查询数据库中的数据
$sql = "SELECT * FROM 表名";
$result = $conn->query($sql);

// 导出数据为CSV格式
$output = fopen("导出的文件路径.csv", "w");
while ($row = $result->fetch_assoc()) {
    fputcsv($output, $row);
}

// 关闭文件和数据库连接
fclose($output);
$conn->close();
?>

In the above sample code, we also first create a connection to the database. Then we query the data in the database through the SELECT statement and save the result in the $result variable. Then use the fopen function to open the file, use the fputcsv function to write the query results into the file line by line, and finally close the file and database connection.

Summary:
This article introduces how to use PHP to implement data import and export functions, and provides specific code examples. Through these sample codes, we can understand how to use PHP to import and export data, and make appropriate modifications and extensions according to actual needs. Importing and exporting data are common operations in web development, and mastering these skills is very important for developers.

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