Use of php pdo placeholder (explanation with code examples)

This article explains the use of php pdo placeholder.

Use of php pdo placeholder (code example explanation)

Use of php pdo

Prevent sql injection

$dbms='mysql';//数据库类型
$host='localhost';//数据库主机名
$dbName='test';//使用的数据库
$user='root';//数据库连接用户名
$pass='root';//对应的密码
$dsn="$dbms:host=$host;dbname=$dbName"; 
try{
$db=newPDO($dsn,$user,$pass);//初始化一个PDO对象
}catch(PDOException$e){
die("Error!:".$e->getMessage()."
");
}
$username=isset($_GET['username'])?$_GET['username']:'';
$ip=isset($_GET['ip'])?$_GET['ip']:'';
$mac=isset($_GET['mac'])?$_GET['mac']:'';
$apMac=isset($_GET['apMac'])?$_GET['apMac']:'';
$loginTime=isset($_GET['loginTime'])?$_GET['loginTime']:'';
$time=date('Y-m-dH:i:s');
 
//编写sql使用占位符
$sql="insertintotest(username,ip,mac,apMac,loginTime,insert_time)
values(:username,:ip,:mac,:apMac,:loginTime,'$time')";
$query=$db->prepare($sql);
/**
感觉挺麻烦的
$query->bindParam(':username',$username);
$query->bindParam(':ip',$ip);
$query->bindParam(':mac',$mac);
$query->bindParam(':apMac',$apMac);
$query->bindParam(':loginTime',$loginTime);
$query->execute();
**/
$result=$query->execute(array(
    ':username'=>$username,
    ':ip'=>$ip,
    ':mac'=>$mac,
    ':apMac'=>$apMac,
    ':loginTime'=>$loginTime,
));

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