无法修复mysql_num_rows错误信息

Question

我试着用mysql_num_rows函数对num_rows进行计数，我总是收到错误。我的查询没有错误。可能是什么问题

<?php 

if(isset($_POST['search'])){ 

$search = $_POST['search']; 
// connect to database 
$con = mysqli_connect("localhost", "root","", "ajax") or die ("could not connect to database"); 

$query = "SELECT * FROM searchengine WHERE title LIKE '%$search%' "; 
$get_query = mysqli_query($con, $query) or die("can't execute query"); 
$rows = mysqli_fetch_array($get_query); 

$num = mysql_num_rows($get_query); 
echo $num; 

while($row = mysqli_fetch_array($get_query)){ 
echo "resuslts found ".'<br/>'; 
echo $row['title']; 


} 


} 
else{ 
echo " not set"; 
} 



?> 

Answer 1

你$ get_query是mysqli的语法，而在另一方面，你正在使用$ NUM在MySQL .. 尝试两个相同的格式。它应该工作。

Answer 2

你在混合mysqli（注意我）和mysql函数。这两个库是非可互换，并从一个结果是不可用的另一个。

的代码应该是：

$num = mysqli_num_rows($get_query); 
      ^---- 

Answer 3

尝试mysqli

$num = mysqli_num_rows($get_query); 

Answer 4

试试这个：

if(isset($_POST['search'])){ 

$search = $_POST['search']; 

// connect to database 

$con = mysqli_connect("localhost", "root","", "ajax") or die ("could not connect to database"); 

$query = "SELECT * FROM searchengine WHERE title LIKE '%$search%' "; 

$get_query = mysqli_query($con, $query) or die("can't execute query"); 

$num = mysqli_num_rows($get_query); 

echo $num . "resuslts found ".'<br/>'; 

while($row = mysqli_fetch_array($get_query)){ 

echo $row['title']; 

} 

} 

else{ 

echo " not set"; 

}