MySQL查询仅返回COUNT

Question

On my site I am executing an SQL query to fill information. The section of code doing so is this:

$user = mysqli_real_escape_string(db_connect(),$_SESSION['UserName']);
$sqlStr = "SELECT * FROM tbl WHERE username='{$user}'";
$out = mysqli_query(db_connect(), $sqlStr);

$settings = False;
if(!(0 == mysqli_num_rows($out))){
    $settings = True;
    $res = mysqli_fetch_assoc($out);
}

Which should only return one row for a given user. However, the output is extremely funky. For a given user who has an entry in the database, the output is as follows:

mysqli_result Object ( [current_field] => 0 [field_count] => x [lengths] => Array ( [x] => x ) [num_rows] => 1 [type] => 0 )

This is correct, but then when mysqli_fetch_assoc is performed, the result is this:

Array ( [COUNT] => 2 ) 

I am completely failing to understand how it is returning a COUNT at all, let alone 2 rows. There isn't even 2 rows in the database. This happens for any username.

Answer 1

A workaround has been found. The output is iterated through with a while() loop beforehand. The following is the working code:

$settings = False;
If(!(0 == mysqli_num_rows($out))){
    $settings = True;
    while($res = mysqli_fetch_assoc($out)){
        $var = $res['var'];

        break;
    }
}

and then using $var throughout the site instead of $res['var']. This properly fills the information. This fixes the issue, though I still don't understand what was causing the issue in the first place.