mysql_num_rows导致内部服务器错误

Question

我检查记录是否存在：

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

第三行给我的错误：

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

什么建议吗？谢谢！

Answer 1

你需要使用mysqli_num_rows()而是更改为：

echo mysqli_num_rows($existed); 

Answer 2

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

请使用

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); 
?> 

它应该是这样的

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

试试这个，它会工作。