pdo sqlserver

PHP代码如果想要用以上的方式兼容linux服务器和windows服务器，那么大概的示例代码是这样的。

<?php
header("Content-type: text/html; charset=utf-8");

if(PATH_SEPARATOR==':')
    echo '本机操作系统是：Linux<br>';
else
    echo '本机操作系统是：Windows<br>';

  try {
      //服务器
      $host = "127.0.0.1";
      $port = '1433';
      $dbname = "databasename";
      $username = "sa";
      $pw = "xxxwtxxx";
      $dbh = null;
      if(PATH_SEPARATOR==':'){
          $dbh = new PDO ("dblib:host=$host:$port;dbname=$dbname","$username","$pw");
      }else{

          $dbh = new PDO("sqlsrv:Server=$host,$port;Database=$dbname",$username,$pw);
      }

  } catch (PDOException $e) {
      echo "Failed to get DB handle: " . $e->getMessage() . "\n";
      exit;
  }

  $stmt = $dbh->prepare("SELECT top 1 * FROM tablename");
  $stmt->execute();
  while ($row = $stmt->fetch()) {
      var_dump($row);
  }
  unset($dbh); unset($stmt);