php - 多张图片上传不移动目录中的文件

Question

尝试构建一个多图像上传，从我的表单中获取 3 个提交的文件并将它们存储在我的服务器上。

我有以下内容，但无论我收到什么“无效文件”，任何人都可以看到我哪里出错了吗？

for($i = 0; $i < 3; $i++) {
 $aFile = $_FILES['file'][$i];




    $allowedExts = array("jpg", "jpeg", "gif", "png");
    $extension = end(explode(".", $aFile["file"]["name"]));
    if ((($aFile["file"]["type"] == "image/gif")
    || ($aFile["file"]["type"] == "image/jpeg")
    || ($aFile["file"]["type"] == "image/png")
    || ($aFile["file"]["type"] == "image/pjpeg"))
    && ($aFile["file"]["size"] < 20000)
    && in_array($extension, $allowedExts))
      {
      if ($aFile["file"]["error"] > 0)
        {
        echo "Return Code: " .$aFile["file"]["error"] . "<br>";
        }
      else
        {


        if (file_exists("upload/" . $aFile["file"]["name"]))
          {
          echo $aFile["file"]["name"] . " already exists. ";
          }
        else
          {
          move_uploaded_file($aFile['tmp_name'],
          "upload/" . date('U')."-".$aFile["file"]["name"]);  // add a unique string to the uploaded filename so that it is unique.
          echo "Image Uploaded Successfully";
          }
        }
      }
    else
      {
      echo "Invalid file";

    }

}

** HTML **

<li>
    <label for="picture_1">picture 1 : </label>
    <input type="file" name="file">
</li>
<li>
    <label for="picture_2">picture 2 : </label>
    <input type="file" name="picture_2">
</li>
<li>
    <label for="picture_3">picture 3 : </label>
    <input type="file" name="picture_3">
</li>

Answer 1

我猜，主要问题是您的 HTML 元素名称和 $_FILES 中使用的名称无法匹配，即您使用了第一个文件输入名称"file"。它应该是“picture_1”。并且您在文件处理部分使用了索引 0 到 2。匹配“picture_1”、“picture_2”和“picture_3”应该是1到3。

请注意，您的表单应包含 enctype="multipart/form-data" ，否则您的文件将不会被上传。这是正确的:

有两种实现方法:
(1)分别命名输入的文件如picture_1、picture_2等
(2) 将文件输入命名为一个组，例如 file[] .

方法 1:分别命名文件输入

HTML

<form method="post" enctype="multipart/form-data">
    <li>
        <label for="picture_1">picture 1 : </label>
        <input type="file" name="picture_1" id="picture_1" />
    </li>
    <li>
        <label for="picture_2">picture 2 : </label>
        <input type="file" name="picture_2" id="picture_2" />
    </li>
    <li>
        <label for="picture_3">picture 3 : </label>
        <input type="file" name="picture_3" id="picture_3" />
    </li>
    <input type="submit" name="submit" value="Upload" />
</form>

PHP

if(sizeof($_FILES)){ 
    for($i = 1; $i <= 3; $i++) {
     $aFile = $_FILES['picture_'.$i];
     if(empty($aFile['tmp_name'])) continue; # skip for empty elements

        $allowedExts = array("jpg", "jpeg", "gif", "png");
        $extension = end(explode(".", $aFile["name"]));
        if ((($aFile["type"] == "image/gif")
        || ($aFile["type"] == "image/jpeg")
        || ($aFile["type"] == "image/png")
        || ($aFile["type"] == "image/pjpeg"))
        && ($aFile["size"] < 20000)
        && in_array(strtolower($extension), $allowedExts))
          {
          if ($aFile["error"] > 0)
            {
            echo "Return Code: " .$aFile["error"] . "<br>";
            }
          else
            {       
            if (file_exists("upload/" . $aFile["name"]))
              {
              echo $aFile["name"] . " already exists. ";
              }
            else
              {
              move_uploaded_file($aFile['tmp_name'], 
                "upload/" . date('U')."-".$aFile["name"]); 
              echo "Image Uploaded Successfully";
              }
            }
          }
        else
        {
          echo "Invalid file";  
        }
    }
}

方法 2:将文件输入命名为一个组

HTML

<form method="post" enctype="multipart/form-data">
    <li>
        <label for="picture_1">picture 1 : </label>
        <input type="file" name="file[]" id="picture_1" />
    </li>
    <li>
        <label for="picture_2">picture 2 : </label>
        <input type="file" name="file[]" id="picture_2" />
    </li>
    <li>
        <label for="picture_3">picture 3 : </label>
        <input type="file" name="file[]" id="picture_3" />
    </li>
    <input type="submit" name="submit" value="Upload" />
</form>

PHP

if(sizeof($_FILES)){        
    for($i = 0; $i < 3; $i++) {
        $name       = $_FILES['file']['name'][$i];
        $type       = $_FILES['file']['type'][$i];
        $tmp_name   = $_FILES['file']['tmp_name'][$i];
        $error     = $_FILES['file']['error'][$i];
        $size       = $_FILES['file']['size'][$i];

        if(empty($name)) continue; # skip for empty element

        $allowedExts = array("jpg", "jpeg", "gif", "png");
        $extension = end(explode(".", $name));
        if ((  ($type == "image/gif")
            || ($type == "image/jpeg")
            || ($type == "image/png")
            || ($type == "image/pjpeg"))
            && $size < 20000
            && in_array(strtolower($extension), $allowedExts) )
          {
          if ($error > 0)
            {
            echo "Return Code: " .$error . "<br>";
            }
          else
            {               
            if (file_exists("upload/" . $name))
              {
              echo $aFile["file"]["name"] . " already exists. ";
              }
            else
              {
              move_uploaded_file($tmp_name,
              "upload/" . date('U')."-".$name); 
              echo "Image Uploaded Successfully";
              }
            }
          }
        else
          {
          echo "Invalid file";      
        }       
    }
}

学分:

• 应使用小写检查文件扩展名 strtolower() .
• 如果您使用 <label for="some_id"> ， 你可以在各自的 HTML 元素中具有相同的 ID 属性，例如 <input
type="file" name="..." id="some_id" /> .点击标签时，会触发元素的onclick事件。