[使用PHP从数据库填充复选框-仅选中最后一个选项

Question

我正在尝试使用我的mysql数据库中的数据填充复选框，但由于某种原因，仅选中了最后一个复选框（例如，如果应选中汽车，木工和手动工具，则仅选中手动工具），我可以不知道为什么。 mysql语句运行正常，并向我提供了正确的信息。这是相关的代码。

<?php

require_once('../../private/initialize.php');
require_login(); 
if(!isset($_GET['id'])) {
  redirect_to(url_for('/members/show_member_tools.php'));
}
$id = $_GET['id'];

if(is_post_request()) {

  // Handle form values sent by new.php

  $tool = [];
  $tool['tool_ID'] = $id;
  $tool['serial_number'] = $_POST['serial_number'] ?? '';
  $tool['tool_name'] = $_POST['tool_name'] ?? '';
  $tool['tool_description'] = $_POST['tool_description'] ?? '';
  $tool['tool_picture'] = $_POST['tool_picture'] ?? '';
  $category =[];
  $category = $_POST['category_ID'];
  $result = update_tool($tool, $category);

    //get info for checkboxes
    global $db;


  if($result === true) {
    $_SESSION['message'] = "The tool has been updated sucessfully";
    redirect_to(url_for('/members/show_tool.php?id=' . $id));
  } else {
    $errors = $result;
  }


} else {

  $tool = find_tool_by_id($id);
      if(isset($_GET['id'])){
    $id=$_GET['id'];
    $sql = "select category_name from category INNER JOIN tool_category ON category.category_ID = tool_category.category_ID where tool_category.tool_id=$id";
    $query = mysqli_query($db, $sql);

    while($row=mysqli_fetch_array($query)) {

//      $str = "";
      $str = $row['category_name'];
      echo $str;


      if (strpos($str , "automotive")!== false){
        $checked1 ="checked";
        echo "made it to automotive";
        } else {
        $checked1 ="";
      }

      if (strpos($str , "carpentry")!== false){
        $checked2 ="checked";
        echo "made it to carpentry";
        } else {
        $checked2 ="";
      }

      if (strpos($str , "home maintenance")!== false){
        $checked3 ="checked";
        echo "made it to home maintenance";
      } else {
        $checked3 ="";
      }

      if (strpos($str , "plumbing")!== false){
        $checked4 ="checked";
      } else {
        $checked4 ="";
      }

      if (strpos($str , "yard and garden")!== false){
        $checked5 ="checked";
      } else {
        $checked5 ="";
      }

      if (strpos($str , "hand tools")!== false){
        $checked6 ="checked";
      } else {
        $checked6 ="";
      } 

    }//end while loop    

  } //end if

} //end else
  $tool_set = find_all_tools();
  $tool_count = mysqli_num_rows($tool_set);
  mysqli_free_result($tool_set);
?>

<?php $page_title = 'Edit Tool'; ?>
<?php include(SHARED_PATH . '/header.php'); ?>

<div id="content">

  <div class="center">
    <a href="<?php echo url_for('/members/show_member_tools.php'); ?>">&laquo; Back to My Tools</a>


    <h2>Edit Tool</h2>
  </div>
    <?php echo display_errors($errors); ?>
    <form action="<?php echo url_for('/members/edit_tool.php?id=' . h(u($id))); ?>" method="post">

      <fieldset class="form">
         <img src ="<?php echo h($tool['tool_picture']); ?>"  alt="<?php echo h($tool['tool_picture']); ?>"width="150"><br>
        <label for="serial_number">Serial Number</label><br>
          <input type="text" name="serial_number" value="<?php echo h($tool['serial_number']); ?>" ><br>

        <label for="tool_name">Tool Name</label><br>
          <input type="text" name="tool_name" value="<?php echo h($tool['tool_name']); ?>" ><br>

        <label for="tool_description">Tool Description</label><br>
          <input type="text" name="tool_description" value="<?php echo h($tool['tool_description']); ?>" ><br>
        <label for="category_ID">Tool Category: </label><br>  
         <input type="checkbox" name="category_ID[]" value="1" <?php echo $checked1; ?>> <label for="1">Automotive</label> <br>
         <input type="checkbox" name="category_ID[]" value="2" <?php echo $checked2; ?>> <label for="2">Carpentry</label> <br>
         <input type="checkbox" name="category_ID[]" value="3" <?php echo $checked3; ?>> <label for="3">Home Maintenance</label> <br>
         <input type="checkbox" name="category_ID[]" value="4" <?php echo $checked4; ?>> <label for="4">Plumbing </label><br>
         <input type="checkbox" name="category_ID[]" value="5" <?php echo $checked5; ?>> <label for="5">Yard and Garden</label> <br>
         <input type="checkbox" name="category_ID[]" value="6" <?php echo $checked6; ?>> <label for="6">Hand Tools</label> <br>

        <input type="submit" value="Edit Tool" >

          <a class="block" href="<?php echo url_for('/members/delete_tool.php?id=' . $id); ?>">Delete Tool</a>

      </fieldset>

    </form>
    <div class="push"></div>
  </div>

<?php include(SHARED_PATH . '/footer.php'); ?>