mysqli_num_rows() expects parameter 1 to be mysqli_result, array given

问题

I've been trying to look deep into the script, but I still can't find the problem. here's the script

global $con;
$a= "SELECT id_list FROM list ORDER BY id_list";
$b = mysqli_query($con, $a);
$c=  mysqli_fetch_assoc($b);        
    if(mysqli_num_rows($c)==0){
        echo'0';
    }else{
        echo '1';
    }       

the error that appear is

mysqli_num_rows() expects parameter 1 to be mysqli_result, array given

thank you in advance.

回答1:

You have use mysqli_result parameter so mysqli_num_rows($b) .

read manual here link

来源：https://stackoverflow.com/questions/42358924/mysqli-num-rows-expects-parameter-1-to-be-mysqli-result-array-given