//自 PHP 5.5.0 起已廢棄。
    $mysql_conf = array(
        'host'    => '127.0.0.1:3306', 
        'db'      => 'test', 
        'db_user' => 'root', 
        'db_pwd'  => 'root', 
        );
    $mysql_conn = @mysql_connect($mysql_conf['host'], $mysql_conf['db_user'], $mysql_conf['db_pwd']);
    if (!$mysql_conn) {
        die("無法連接到數(shù)據(jù)庫:\n" . mysql_error());//診斷連接錯(cuò)誤
    }
    mysql_query("set names 'utf8'");//編碼轉(zhuǎn)化為UTF-8
    //判斷連接的數(shù)據(jù)庫是否存在
    $select_db = mysql_select_db($mysql_conf['db']);
    if (!$select_db) {
        die("無法連接到數(shù)據(jù)庫:\n" .  mysql_error());
    }
    $sql = "select * from user;";
    $res = mysql_query($sql);
    if (!$res) {
        die("could get the res:\n" . mysql_error());
    }
    
    while ($row = mysql_fetch_assoc($res)) {
        print_r($row);
    }
    
    mysql_close($mysql_conn);

//PHP與Mysqli擴(kuò)展,面向過程、對(duì)象
 $mysql_conf = array(
     'host'    => '127.0.0.1:3306', 
     'db'      => 'test', 
     'db_user' => 'root', 
     'db_pwd'  => 'joshua317', 
     );
 
 $mysqli = @new mysqli($mysql_conf['host'], $mysql_conf['db_user'], $mysql_conf['db_pwd']);
 if ($mysqli->connect_errno) {
     die("無法連接到數(shù)據(jù)庫:\n" . $mysqli->connect_error);//診斷連接錯(cuò)誤
 }
 $mysqli->query("set names 'utf8';");//編碼轉(zhuǎn)化utf8
 $select_db = $mysqli->select_db($mysql_conf['db']);
 if (!$select_db) {
     die("could not connect to the db:\n" .  $mysqli->error);
 }$sql = "select uid from user where name = 'joshua';";
 $res = $mysqli->query($sql);
 if (!$res) {
     die("sql error:\n" . $mysqli->error);
 }
  while ($row = $res->fetch_assoc()) {
         var_dump($row);
     }
 
 $res->free();
 $mysqli->close();

//PHP與PDO擴(kuò)展,面向過程、對(duì)象
  $mysql_conf = array(
      'host'    => '127.0.0.1:3306', 
      'db'      => 'test', 
      'db_user' => 'root', 
      'db_pwd'  => 'joshua317', 
      );
  $pdo = new PDO("mysql:host=" . $mysql_conf['host'] . ";dbname=" . $mysql_conf['db'], $mysql_conf['db_user'], $mysql_conf['db_pwd']);//創(chuàng)建一個(gè)pdo對(duì)象
  $pdo->exec("set names 'utf8'");
  $sql = "select * from user where name = ?";
  $stmt = $pdo->prepare($sql);
  $stmt->bindValue(1, 'joshua', PDO::PARAM_STR);
  $rs = $stmt->execute();
  if ($rs) {
      // PDO::FETCH_ASSOC 關(guān)聯(lián)數(shù)組形式
      // PDO::FETCH_NUM 數(shù)字索引數(shù)組形式
      while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
          var_dump($row);
      }
  }
  
  $pdo = null;//關(guān)閉連接