我只是想学习准备好的语句，我正在按照 PHP 手册指导我完成，我已经在 stackoverflow 上检查了有关此问题的答案，但是，我找不到任何解决方案，$stmt->num_rows 总是（返回 0 )
stackoverflow 上有一篇文章讨论了这个问题，他们建议在 $stmt-num_rows 之前使用 $stmt->store_result()，但 $stmt->num_rows 返回 0
有人可以告诉我我在这里做错了什么......我只是厌倦了程序风格的编码，我想通过准备好的陈述来提高我的技能
这是下面的功能
function get_all()
{
// ** Initializing the Connection
$mysqli = Connect();
$sql = ( ' SELECT * FROM `users` ' );
$stmt = $mysqli->prepare($sql);
$stmt->execute();
$res = $stmt->get_result();
echo $num_count = $stmt->num_rows();
$user = array();
for ($counter = 0; $row = $res->fetch_assoc(); $counter++)
{
$user[$counter] = $row;
}
return $user;
}
// 这是第二次更新
function get_all()
{
// ** Initializing the Connection
$mysqli = Connect();
$sql = ( ' SELECT * FROM `users` ' );
$stmt = $mysqli->prepare($sql);
$stmt->execute();
$res = $stmt->get_result();
echo $num_count = $stmt->num_rows;
$user = array();
while($row = $res->fetch_assoc())
{
$user[] = $row;
}
return $user;
}
// 第三次更新
function get_alll()
{
// ** Initializing the Connection
$mysqli = Connect();
// no need to use * character,
// need to write query this way
$sql = ( ' SELECT `id`,`fname`,`lname`,`uname`,`email` FROM `users` ' );
$stmt = $mysqli->prepare($sql);
// here need to use bind param
$stmt->bind_result( $id, $fname, $lname, $uname, $email);
$stmt->execute();
// it's important to store the result
// before using num rows
$res = $stmt->store_result();
echo $num_count = $stmt->num_rows;
//
while($stmt->fetch())
{
echo $fname;
}
}