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这是我的 PHP 代码

// category filter
    if(!isset($_POST['products']) || $_POST['products'] == ""){
        $category_filter = "";
    } else {
        $category_filter = " AND cat_id='".$_POST['products']."'";
    }

// offers filter
    if($_POST['offer'] != "YES")
    {
        $offer_filter = "";
    } else {
        $offer_filter = " AND offer=1"; 
    }

    $sql = $db->get_rows("
        SELECT *, ( 3959 * ACOS( COS( RADIANS(".$_POST['lat'].") ) * COS( RADIANS( latitude ) ) * COS( RADIANS( longitude ) - RADIANS(".$_POST['lng'].") ) + SIN( RADIANS(".$_POST['lat'].") ) * SIN( RADIANS( latitude ) ) ) ) AS distance 
        FROM stores 
    WHERE status=1 AND approved=1 ".$offer_filter." ".$category_filter." 
    HAVING distance <= ".$_POST['distance']." 
    ORDER BY distance ASC 
    LIMIT 0,60");

我希望$offer_filter在上面的 SQL 查询中获得正确的值，因为$category_filter. 我想我在某个地方遗漏了一些东西......请如果有人可以帮助我......

以下是我在复选框输入的 php 索引文件中的 HTML 代码...

<input type="checkbox" name="offer" value="Yes" onChange="cachesearch = '';$('#clinic-finder-form').submit();"> Discount Offers Available
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