pdo更新数据

$pdo = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);

//准备SQL语句,占位符我们不再用?,用"命名占位符"
  $sql="update erj_user set freeze_money=:freeze_money where id=:id ";

//创建预处理对象  
$stmt = $pdo->prepare($sql); 

$stmt->execute([‘freeze_money‘=>$cha_freeze_money,‘id‘=>$row[‘user_id‘]]); 
$data_stmt=$stmt->rowCount();