将MySQL查询限制为偶数个结果(使用PHP和mysqli)

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

// 查询语句
$sql = "SELECT * FROM your_table_name";
$result = $conn->query($sql);

$count = 0;
$evenResults = [];

if ($result->num_rows > 0) {
    // 输出数据
    while($row = $result->fetch_assoc()) {
        if ($count % 2 == 0) {
            $evenResults[] = $row;
        }
        $count++;
    }
} else {
    echo "0 结果";
}

$conn->close();

// 输出偶数个结果
echo "偶数个结果：" . count($evenResults);
?>