Question

我遇到了execute（）的问题：致命错误：在非对象上调用成员函数execute（）我似乎已经正确使用它，我在StackOverflow上查找了其他问题，我认为这是正确的。

  $db = dbConnect();
  $query = "SELECT * FROM 'users' WHERE 'username' = '".$username."'";
  $stmt = $db->prepare($query);
  $stmt->execute();

其中dbConnect（）是函数：

  function dbConnect() {
      $db = mysqli_connect("localhost", "root", "example", "dbexample")
          or die("Errore nella connessione al db: " . mysqli_connect_error());
      return $db;
  }

由于

Answer 1

请使用此：

$query = "SELECT * FROM `users` WHERE 'username' = '".$username."'";

而不是：

$query = "SELECT * FROM 'users' WHERE 'username' = '".$username."'";

Answer 2

试试这个

<?php
$db = mysqli_connect("localhost", "root", "example", "dbexample")
          or die("Errore nella connessione al db: " . mysqli_connect_error());
      $stmt = $db->prepare("SELECT * FROM users where username =".$username);
      $stmt->execute();
?>

致命错误：在非对象上调用成员函数execute（）

2 个答案: