php mysql如何分表

<?php
// 数据库连接
$mysqli = new mysqli("localhost", "username", "password", "database");

if ($mysqli->connect_errno) {
    echo "Failed to connect to MySQL: " . $mysqli->connect_error;
    exit();
}

// 分表函数
function getTable($id) {
    return 'table_' . ($id % 10);
}

// 插入数据
$id = 123;
$table = getTable($id);
$sql = "INSERT INTO $table (id, name) VALUES ($id, 'John Doe')";
if ($mysqli->query($sql) === TRUE) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $mysqli->error;
}

// 查询数据
$table = getTable($id);
$sql = "SELECT * FROM $table WHERE id = $id";
$result = $mysqli->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 results";
}

$mysqli->close();
?>