mysql_num_rows導致內部服務器錯誤

Question

我檢查記錄是否存在：

$query = "SELECT * FROM `collegeInfo` WHERE `name` = '$name' "; 
$existed = mysqli_query($con, $query); 
echo mysql_num_rows($existed); 

第三行給我的錯誤：

500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.

什麼建議嗎？謝謝！

Answer 1

你需要使用mysqli_num_rows()而是更改爲：

echo mysqli_num_rows($existed); 

Answer 2

您正在使用`mysql_num_rows（），而不是mysqli_num_rows()

請使用

echo mysqli_num_rows($existed); 

Answer 3

You need to know, you should avoid using mysql and mysqli combined as you have done here:

<?php 
     echo mysql_num_rows($existed); 
?> 

它應該是這樣的

<?php 
    echo mysqli_num_rows($existed); 
?> 

試試這個，它會工作。