I made a mistake myself, thank you all

I made a mistake myself, thank you everyone

This question has been closed, reason: Unable to obtain exact result

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I made a mistake myself, thank you everyone

bindParam is a method of PDOStatement. Of course you can’t find it in PDO.

PDOStatement is the return object of PDO::prepare(). I don’t know where to look for the code here. I named the PDO object as $stmt without getting ->prepare() The returned PDOStatement.

$pdo = new PDO("mysql:host=$servername;dbname=myDB", $username, $password);//先新建一个PDO
$pdo->->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);//开启PDO的报错
$sql = 'SELECT * FROM article WHERE id > ?';
try{
    $stmt = $pdo->prepare(sql);//返回的statment的值赋给$stmt
    $stmt -> bindParam(要绑定的占位符的位置, 要绑定的变量 [, 数据类型]);//bindParam()是$stmt的方法而不是$pdo的方法
    $stmt -> execute();//执行sql语句
} catch (PDOException $e) {
        echo 'Execute SQL failed: ' . $e->getMessage();
        exit();
    }

It should be like this