How to use PHP to implement data paging and search functions

How to use PHP to implement data paging and search functions

In website development, data paging and search functions are very common requirements. Through reasonable paging and search methods, user experience can be improved, data loading time can be reduced, and system performance can be improved. This article will introduce how to use PHP to implement data paging and search functions, and provide corresponding code examples.

Data paging function implementation:

The data paging function can divide a large amount of data into several pages for display. Each page displays a certain amount of data. Users can browse different data pages by switching pages. The following is a sample code that uses PHP to implement data paging function:

<?php
// 使用的数据库连接信息
$servername = "localhost";
$username = "root";
$password = "password";
$dbname = "database";

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

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

// 每页显示的数据数量
$pageSize = 10;

// 当前页码，默认为第一页
$page = isset($_GET['page']) ? $_GET['page'] : 1;

// 计算数据的起始位置
$start = ($page - 1) * $pageSize;

// 查询数据的 SQL 语句
$sql = "SELECT * FROM table LIMIT $start, $pageSize";
$result = $conn->query($sql);

// 输出数据
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "字段1：" . $row["field1"]. " - 字段2：" . $row["field2"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 翻页链接
$prevPage = $page - 1;
$nextPage = $page + 1;

echo "<a href='?page=$prevPage'>上一页</a> ";
echo "<a href='?page=$nextPage'>下一页</a>";

// 关闭数据库连接
$conn->close();
?>

In the above code:

1. First establish a database connection;
2. Specify the data displayed on each page The amount of data and the current page number;
3. Calculate the starting position of the data query based on the current page number;
4. Execute the SQL statement for querying data and output the data;
5. Output the page turning link , when the link is clicked, the corresponding page number parameter will be passed;
6. Close the database connection.

Data search function implementation:

The data search function can search in the data based on the keywords entered by the user and return the corresponding results. The following is a sample code that uses PHP to implement the data search function:

<?php
// 使用的数据库连接信息
$servername = "localhost";
$username = "root";
$password = "password";
$dbname = "database";

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

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

// 用户输入的关键词
$keyword = $_GET['keyword'];

// 查询数据的 SQL 语句
$sql = "SELECT * FROM table WHERE field1 LIKE '%$keyword%' OR field2 LIKE '%$keyword%'";
$result = $conn->query($sql);

// 输出数据
if ($result->num_rows > 0) {
    while ($row = $result->fetch_assoc()) {
        echo "字段1：" . $row["field1"]. " - 字段2：" . $row["field2"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 关闭数据库连接
$conn->close();
?>

In the above code:

1. First establish a database connection;
2. Get the key to user input Word;
3. Execute the SQL statement for querying data and output the data;
4. If there is no data that meets the conditions, "0 result" will be output;
5. Close the database connection.

The SQL statement here uses the LIKE operator for fuzzy matching, which can be modified according to needs.

In summary, through the above code examples, we can implement data paging and search functions in PHP. In actual applications, depending on specific needs and the size of the data, these functions may need to be further optimized and expanded, such as using caching, asynchronous loading using AJAX, etc. But these code examples can provide us with a foundation and starting point to help us quickly implement corresponding functions, improve user experience, and improve system performance.

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