如何在PHP/HTML中拥有多个搜索输入/值

<form action="search.php" method="GET">
  <input type="text" name="search1" placeholder="搜索条件1">
  <input type="text" name="search2" placeholder="搜索条件2">
  <input type="submit" value="搜索">
</form>

<form action="search.php" method="GET" id="searchForm">
  <div id="searchInputs">
    <input type="text" name="search1" placeholder="搜索条件1">
  </div>
  <input type="button" value="添加搜索条件" onclick="addSearchInput()">
  <input type="submit" value="搜索">
</form>

<script>
  function addSearchInput() {
    var searchInputs = document.getElementById("searchInputs");
    var newInput = document.createElement("input");
    newInput.type = "text";
    newInput.name = "search" + (searchInputs.childElementCount + 1);
    newInput.placeholder = "搜索条件" + (searchInputs.childElementCount + 1);
    searchInputs.appendChild(newInput);
  }
</script>