SQL計數查詢返回的行數預設為1，而不是實際的行數

Question

下面是從中獲取數據庫表中許多行的PHP代碼。 但是以下代碼始終將行數返回為1。 請幫助我解決問題，以從數據庫中獲取正確的行數。

$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

如果您執行SELECT COUNT(*)您將返回到第一行的計數值所在的行。 因此，您需要像這樣獲得COUNT()值：

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

Answer 2

這應該工作：

$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);