php - 如果用户从表中填写所有 3 个显示选定值并且如果填写 2 个指定字段显示所有值，我在表单中有 3 个字段

Question

if($_POST['sinitial']=="no")
{
$result = mysqli_query($con,"SELECT * FROM babyname WHERE (iname= '".$_POST['dinitial']."' AND gender= '".$_POST['gender']."' AND ncat= '".$_POST['ncat']."') OR (iname= '".$_POST['dinitial']."' AND gender= '".$_POST['gender']."')");
?>

如果用户输入需要初始>（dinitial）以及性别和名称类别（ncat），我正在尝试从表babynames中输出名称。但是，如果用户不希望只有名称>进入特定类别，否则他希望查看从 >dinitial 开始的所有名称，而不是我的查询应该如何进行？

Answer 1

if($_POST['sinitial']=="no")
{
 $condition = "iname= '".$_POST['dinitial']."' AND gender= '".$_POST['gender']."'";
if(isset($_POST['ncat']) && !empty($_POST['ncat'])) 
 $condition .= "AND ncat= '".$_POST['ncat']."'";
$result = mysqli_query($con,"SELECT * FROM babyname WHERE $condition");

}

Answer 2

else
{

$result = mysqli_query($con,"SELECT * FROM babyname WHERE (iname like '".$_POST['dinitial']."%' AND gender= '".$_POST['gender']."' AND ncat= '".$_POST['ncat']."') OR (iname like  '".$_POST['dinitial']."%' AND gender= '".$_POST['gender']."')");

}

Answer 3

让我们试试这种代码方式..

if($_POST['sinitial']=="no")
{
  $condition = "iname= '".$_POST['dinitial']."' AND gender= '".$_POST['gender']."'";

  if(!empty($_POST['ncat'])) 
     $condition .= "AND ncat= '".$_POST['ncat']."'";

$result = mysqli_query($con,"SELECT * FROM babyname WHERE $condition");

}