2

我多次编辑了这段代码(我是菜鸟 php),我的问题是用这段代码上传多个文件。我只能上传 1 个文件。

这是代码:

<?php
/**
 * uploadFile()
 * 
 * @param string $file_field name of file upload field in html form
 * @param bool $check_image check if uploaded file is a valid image
 * @param bool $random_name generate random filename for uploaded file
 * @return array
 */
function uploadFile ($file_field = null, $check_image = false, $random_name = false) {

  //Config Section    
  //Set file upload path
  $path = 'c:/xampp/htdocs/'; //with trailing slash
  //Set max file size in bytes
  $max_size = 1000000;
  //Set default file extension whitelist
  $whitelist_ext = array('jpg','png','gif');
  //Set default file type whitelist
  $whitelist_type = array('image/jpeg', 'image/png','image/gif');

  //The Validation
  // Create an array to hold any output
  $out = array('error'=>null);

  if (!$file_field) {
    $out['error'][] = "Please specify a valid form field name";           
  }

  if (!$path) {
    $out['error'][] = "Please specify a valid upload path";               
  }

  if (count($out['error'])>0) {
    return $out;
  }

  //Make sure that there is a file
  if((!empty($_FILES[$file_field])) && ($_FILES[$file_field]['error'] == 0)) {

    // Get filename
    $file_info = pathinfo($_FILES[$file_field]['name']);
    $name = $file_info['filename'];
    $ext = $file_info['extension'];

    //Check file has the right extension           
    if (!in_array($ext, $whitelist_ext)) {
      $out['error'][] = "Invalid file Extension";
    }

    //Check that the file is of the right type
    if (!in_array($_FILES[$file_field]["type"], $whitelist_type)) {
      $out['error'][] = "Invalid file Type";
    }

    //Check that the file is not too big
    if ($_FILES[$file_field]["size"] > $max_size) {
      $out['error'][] = "File is too big";
    }

    //If $check image is set as true
    if ($check_image) {
      if (!getimagesize($_FILES[$file_field]['tmp_name'])) {
        $out['error'][] = "Uploaded file is not a valid image";
      }
    }

    //Create full filename including path
    if ($random_name) {
      // Generate random filename
      $tmp = str_replace(array('.',' '), array('',''), microtime());

      if (!$tmp || $tmp == '') {
        $out['error'][] = "File must have a name";
      }     
      $newname = $tmp.'.'.$ext;                                
    } else {
        $newname = $name.'.'.$ext;
    }

    //Check if file already exists on server
    if (file_exists($path.$newname)) {
      $out['error'][] = "A file with this name already exists";
    }

    if (count($out['error'])>0) {
      //The file has not correctly validated
      return $out;
    } 

    if (move_uploaded_file($_FILES[$file_field]['tmp_name'], $path.$newname)) {
      //Success
      $out['filepath'] = $path;
      $out['filename'] = $newname;
      return $out;
    } else {
      $out['error'][] = "Server Error!";
    }

  } else {
    $out['error'][] = "No file uploaded";
    return $out;
  }      
}
?>
<?php
if (isset($_POST['submit'])) {
  $file = uploadFile('file', true, true);
  if (is_array($file['error'])) {
    $message = '';
    foreach ($file['error'] as $msg) {
      $message .= '<p>'.$msg.'</p>';    
    }
  } else {
    $message = "File uploaded successfully";
  }
  echo $message;
}
?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data">
<input name="file" type="file" size="20" multiple="multiple" />
<input name="submit" type="submit" value="Upload files" />
</form>

请帮助我理解...我知道我必须使用foreach

4

5 回答 5

12

您应该将文件字段用作数组,例如file[]

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data">
    <input name="file[]" type="file" size="20" multiple="multiple" />
    <input name="submit" type="submit" value="Upload files" />
</form>

如上更改代码并尝试

于 2013-07-04T05:21:28.307 回答
1

正如其他人指出的那样,您需要将上传字段名称更改为 ie。files[](包括名称后的方括号)。这是相关的,因为它告诉 PHP 它应该将该字段视为一个数组。

此外,在代码中,您可以使用 foreach() 访问上传的文件,如下所示:

foreach ($_FILES['field_name'] as $file)

(显然,在这种情况下,您的 html 字段将是名称 field_name[])这将在其五次迭代中的每一次中返回一个数组,为您提供有关您已发送的所有文件的信息。例如,如果您发送了两个文件,它可能如下所示:

    ["name"]=>
    array(2) {
      [0]=>
      string(5) "dir.c"
      [1]=>
      string(10) "errcodes.h"
    }
    ["type"]=>
    array(2) {
      [0]=>
      string(11) "text/x-csrc"
      [1]=>
      string(11) "text/x-chdr"
    }
    ["tmp_name"]=>
    array(2) {
      [0]=>
      string(14) "/tmp/phpP1iz5A"
      [1]=>
      string(14) "/tmp/phpf31fzn"
    }
    ["error"]=>
    array(2) {
      [0]=>
      int(0)
      [1]=>
      int(0)
    }
    ["size"]=>
    array(2) {
      [0]=>
      int(511)
      [1]=>
      int(38)
    }
  }

重要的是要了解 PHP 会将那些不分类到文件中,然后为每个文件提供其属性,而是列出所有文件的属性。

我希望现在很清楚。

于 2013-07-04T05:41:51.517 回答
1

要从您的浏览器成功发送多个文件,您需要输入将数组传递给 PHP。这是通过附加[]到您<input>的 s 名称的末尾来完成的:

<input type="file" name="filesToUpload[]" multiple>

处理这些文件是棘手的部分。PHP 处理文件上传的方式不同于处理数组中提供的其他 POST 或 GET 数据。文件上传在输入名称和上传文件的索引之间插入了一个元数据键。所以$_FILES['filesToUpload']['name'][0]将获得第一个文件$_FILES['filesToUpload']['name'][1]的名称,并将获得第二个文件的名称......等等。

因为这foreach绝对是使用错误的循环。您最终将在没有任何上下文的情况下自行处理每条元数据。这太不自然了

让我们获取每个文件的索引并一次处理一个文件。我们将for为此使用一个循环。这是一个完全独立的功能示例,用户将多个文件上传到服务器上的文件夹:

<?php
/* 
 * sandbox.php
 */

if (isset($_POST['submit'])) {

    // We need to know how many files the user actually uploaded.
    $numberOfFilesUploaded = count($_FILES['filesToUpload']['name']);

    for ($i = 0; $i < $numberOfFilesUploaded; $i++) {
        // Each iteration of this loop contains a single file.
        $fileName = $_FILES['filesToUpload']['name'][$i];
        $fileTmpName = $_FILES['filesToUpload']['tmp_name'][$i];
        $fileSize = $_FILES['filesToUpload']['size'][$i];
        $fileError = $_FILES['filesToUpload']['error'][$i];
        $fileType = $_FILES['filesToUpload']['type'][$i];

        // PHP has saved the uploaded file as a temporary file which PHP will 
        // delete after the script has ended.
        // Let's move the file to an output directory so PHP will not delete it.
        move_uploaded_file($fileTmpName, './output/' . $fileName);
    }
}

?>

<form method="post" enctype="multipart/form-data">
                              <!-- adding [] Allows us to upload multiple files -->
    <input type="file" name="filesToUpload[]" multiple>
    <input type="submit" name="submit"/>Submit
</form>

要运行此示例,您的文件应如下所示

在此处输入图像描述

您可以使用以下命令启动 PHP 内置网络服务器:

$ php -S localhost:8000

然后转到http://localhost:8000/sandbox.php将运行该示例。


重要提示:上面的示例不进行任何验证。您需要验证所有上传的文件是否安全。

于 2017-11-15T01:28:55.163 回答
0

您必须使用 foreach 循环来上传多个文件。在框架中,您还提供了具有相同功能的组件(即通过使用 foreach 循环)。

于 2013-07-04T05:17:18.337 回答
0

我的建议是

  1. 开始一个循环:foreach ($_FILES[$file_field] as $file) {你有// Get filename字符串的地方
  2. }在函数末尾关闭它
  3. 全部$_FILES[$file_field]改成$file里面

当然,输入必须有Sherin Jose所说的multiple属性( tut),但现在只有8.27%的浏览器完全支持,所以你最好用 JS 添加更多输入,比如

<input type="file" name="file[]" />
<input type="file" name="file[]" />
...

并以相同的方式循环它们

于 2013-07-04T05:46:32.720 回答