如何从mysql查询结果按日期分组在php中给出符号(如更改颜色或fa-up/fa-down

<?php
// 连接到MySQL数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 执行查询语句并按日期分组
$sql = "SELECT DATE(date_column) AS date, COUNT(*) AS count FROM table_name GROUP BY DATE(date_column)";
$result = $conn->query($sql);

// 输出查询结果
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        $date = $row["date"];
        $count = $row["count"];

        // 根据条件更改颜色或fa-up/fa-down
        if ($count > 100) {
            echo "<span style='color: red;'>$date: $count</span><br>";
        } else {
            echo "<span style='color: green;'>$date: $count</span><br>";
        }
    }
} else {
    echo "没有结果";
}

// 关闭数据库连接
$conn->close();
?>