$行不再起作用

Question

I tried to upgrade my working mysql script to mysqli but I'm having some problems with my $rows variable.. $rows doesn't return anything anymore.. echo $rows; returns blanc.

here's my code:\\

<?php
    $host = "***";
    $user = "***";
    $pwd = "***";
    $db_name = "name";

    $link = mysqli_connect($host, $user, $pwd, $db_name)or die("cannot connect"); 



    $sql = mysqli_query($link, "SELECT * FROM foto ORDER BY id DESC LIMIT 25") or die(mysqli_error($link));
    //var_dump($sql);


    while ($rows = mysqli_fetch_assoc($sql))
    {
       echo "<img class='littleshow'"."id='foto".$rows[$id]."'src='".$rows[$foto]."' onclick='Bigscreen(this)'></img>";
    } 
?>

thanks for helping :)

Answer 1

Variables $id and $foto are not defined anywhere, change it to this and you will see there is output echoed, assuming there are rows returned by the query. ($rows[$id] = $rows['id'])

while ($rows = mysqli_fetch_assoc($sql))
{
    echo "<img class='littleshow'"."id='foto".$rows['id']."'src='".$rows['foto']."' onclick='Bigscreen(this)'></img>";
}

Answer 2

echo $rows; returns blank means there was no rows returned by the query.

it's also worth to set full error reporting in PHP to see possible mistakes:

error_reporting(E_ALL);