获取返回的行数mysqli php

Question

I have been trying to solve this for some time. I'm tiring to echo the number of returned rows from the mysql query,

$linkTow  = new mysqli($dbhost, $dbuser, $dbpass, $dbname);
$getVotesSQL = "SELECT null FROM votes WHERE `idgame` = ?";
$getVotesStmt = $linkTow->prepare($getVotesSQL);
$getVotesStmt->bind_param("s", $idGame);
$getVotesStmt->execute();
echo $getVotesStmt->num_rows;
$getVotesStmt->close();
$linkTow->close();

I always get 0.

Answer 1

If you really prefer using $linkTow->prepare then this is the proper way to do it:

$getVotesSQL = "SELECT null FROM votes WHERE `idgame` = ?";
$getVotesStmt = $linkTow->prepare($getVotesSQL);
$getVotesStmt->bind_param("s", $idGame);
$getVotesStmt->execute();
$getVotesStmt->store_result(); // <- IMPORTANT
echo $getVotesStmt->num_rows;
$getVotesStmt->close();
$linkTow->close();

What you are doing before is for $linkTow->query

MANUAL

http://php.net/manual/en/mysqli-stmt.num-rows.php