php读取mysql中signup表里面的id，zhanghao,mima

可以使用以下代码来读取mysql中signup表里面的id，zhanghao,mima：

<?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);
}

$sql = "SELECT id, zhanghao, mima FROM signup";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
  // 输出数据
  while($row = $result->fetch_assoc()) {
    echo "id: " . $row["id"]. " - zhanghao: " . $row["zhanghao"]. " - mima: " . $row["mima"]. "<br>";
  }
} else {
  echo "0 结果";
}
$conn->close();
?>

请注意，这只是一个示例代码，您需要根据您的实际情况进行修改。