SQL计数查询返回预设为1而不是实际行数的行数

Question

下面是PHP代码，我从中获取数据库表中的多个行。但是下面的代码总是以1为单位返回多行。请帮我解决问题，从数据库中获取正确的行数。

$db=mysqli_connect("localhost","root","","test");               
     echo "<div class='row text-center col-lg-12' align='center'>";     
    $cmd="SELECT COUNT(*) FROM product WHERE product_name LIKE '%$search_query%'";

    $result = mysqli_query($db, $cmd);
    $total = mysqli_num_rows($result);

Answer 1

如果您执行SELECT COUNT(*)，您将获得一行，其中计数值位于第一列。所以你需要获得COUNT()这样的值：

$result = mysqli_query($db, $cmd);
$row = mysqli_fetch_array($result);
$total = $row[0];

Answer 2

这应该有效：

$db=mysqli_connect("localhost","root","","test");               
     echo "<div class='row text-center col-lg-12' align='center'>";     
    $cmd="SELECT * FROM product WHERE product_name LIKE '%$search_query%'";

    $result = mysqli_query($db, $cmd);
    $total = mysqli_num_rows($result);