json_encode与MySQL数组

Question

I'm getting an array with values out of my MySQL and I'm trying to json_encode() it. Theres no output though, nothing. Just a white screen, no error, nothing. Any ideas? The array $rows is perfectly filled with values.

if (!$connection = mysqli_connect($db_host, $db_user, $db_pw, $db))
    die( "Connection not successful.\n" );

$sql_qry = "SELECT * FROM `table`;";
if (!$result = mysqli_query($connection, $sql_qry))
    echo "Wasn't able to send query: ".mysqli_error($connection)."\n";

while ($rows[] = mysqli_fetch_assoc($result));

mysqli_close($connection);

echo json_encode($rows);

Answer 1

Your while assignment isn't actually iterating the resultset and assigning the existing rows from your SQL Query to this variable. If you wish to access the entire contents of the returned resultset outside of the scope of your while statement, then you need to walk the resultset and assign each row to an array defined before your while statement's execution:

$rows = array();
while ($ret = mysqli_fetch_assoc($result)):
    $rows[] = $ret;
endwhile;

mysqli_close($connection);

echo json_encode($rows);