php语法+mysql语法查询指定日期范围内的数据

<?php
//数据库信息
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "dbname";
 
// 创建连接
$conn = mysqli_connect($servername, $username, $password, $dbname);
 
// 检查连接
if (!$conn) {
  die("连接失败: " . mysqli_connect_error());
}
 
$begin_date = '2023-02-01';
$end_date = '2023-02-31';
 
$sql = "SELECT * FROM table WHERE pub_date BETWEEN '$begin_date' AND '$end_date'";
 
$result = mysqli_query($conn, $sql);
if (mysqli_num_rows($result) > 0) {
  // 输出数据
  while($row = mysqli_fetch_assoc($result)) {
    echo "序号: " . $row["id"]. " - 金额: " . $row["amount"]. " - 日期: " . $row["pub_date"]. "<br>";
  }
} else {
  echo "暂无数据";
}
 
mysqli_close($conn);
?>