0

嗨，我有一个程序允许用户上传 jpeg。然后对文件做一些事情。我的问题是，当没有文件上传时，它会显示一个错误处理程序并告诉用户上传文件。我不希望它是那样的。即使没有上传文件，我要做的是让该过程继续进行。我怎样才能做到这一点？下面是我的代码。我认为它的某些部分正在做限制。我不知道这里要删除或更改哪个部分。请帮我找出我已经为此工作了好几天了。太感谢了。

    // make a note of the current working directory, relative to root.
    $directory_self = str_replace(basename($_SERVER['PHP_SELF']), '', $_SERVER['PHP_SELF']);

    // make a note of the directory that will recieve the uploaded files //i made it as the same directory where the .php file is
    $uploadsDirectory = $_SERVER['DOCUMENT_ROOT'] . $directory_self;

    // make a note of the location of the upload form in case we need it
    $uploadForm = 'http://' . $_SERVER['HTTP_HOST'] . $directory_self . 'index.php';

    // make a note of the location of the success page
    $uploadSuccess = 'http://' . $_SERVER['HTTP_HOST'] . $directory_self . 'upload.success.php';

    // name of the fieldname used for the file in the HTML form
    $fieldname = 'file';

    // possible PHP upload errors
    $errors = array(1 => 'php.ini max file size exceeded', 
                    2 => 'html form max file size exceeded', 
                    3 => 'file upload was only partial', 
                    4 => 'no file was attached');

    // check the upload form was actually submitted else print form
    isset($_POST['submit'])
        or error('the upload form is neaded', $uploadForm);

    // check for standard uploading errors
    ($_FILES[$fieldname]['error'] == 0)
        or error($errors[$_FILES[$fieldname]['error']], $uploadForm);

    // check that the file we are working on really was an HTTP upload
    @is_uploaded_file($_FILES[$fieldname]['tmp_name'])
        or error('not an HTTP upload', $uploadForm);

    // validation... since this is an image upload script we 
    // should run a check to make sure the upload is an image
    @getimagesize($_FILES[$fieldname]['tmp_name'])
        or error('only image uploads are allowed', $uploadForm);

    // make a unique filename for the uploaded file and check it is 
    // not taken... if it is keep trying until we find a vacant one
    $now = time();
    while(file_exists($uploadFilename = $uploadsDirectory.$now.'-'.$_FILES[$fieldname]['name']))
    {
        $now++;
    }

    // now let's move the file to its final and allocate it with the new filename
    @move_uploaded_file($_FILES[$fieldname]['tmp_name'], $uploadFilename)
        or error('receiving directory insuffiecient permission', $uploadForm);

    SOME CODE HERE THAT CHECKS IF THERE OR NO FILE IS UPLOADED AND DO THE PROCESS

    // make an error handler which will be used if the upload fails
    function error($error, $location, $seconds = 5)
    {
        header("Refresh: $seconds; URL=\"$location\"");
        echo '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"'."\n".
        '"http://www.w3.org/TR/html4/strict.dtd">'."\n\n".
        '<html lang="en">'."\n".
        '   <head>'."\n".
        '       <meta http-equiv="content-type" content="text/html; charset=iso-8859-1">'."\n\n".
        '       <link rel="stylesheet" type="text/css" href="stylesheet.css">'."\n\n".
        '   <title>Upload error</title>'."\n\n".
        '   </head>'."\n\n".
        '   <body>'."\n\n".
        '   <div id="Upload">'."\n\n".
        '       <h1>Upload failure</h1>'."\n\n".
        '       <p>An error has occured: '."\n\n".
        '       <span class="red">' . $error . '...</span>'."\n\n".
        '       The upload form is reloading</p>'."\n\n".
        '    </div>'."\n\n".
        '</html>';
        exit;
    } // end error handler
4

1 回答 1

0

因此，与其使用上传的版本，不如使用单独的文件。

在您的代码中：

// check for standard uploading errors
($_FILES[$fieldname]['error'] == 0)
    or error($errors[$_FILES[$fieldname]['error']], $uploadForm);

将其更改为：

// check for standard uploading errors
if($_FILES[$fieldname]['error'] > 0 && $_FILES[$fieldname]['error'] != 4)
    error($errors[$_FILES[$fieldname]['error']], $uploadForm);
// your error is caused by the "no file was attached", let's skip that error
if($_FILES[$fieldname]['error'] == 4)
    // select your default image and skip all uploading steps

希望这对您有所帮助。

于 2013-11-07T01:06:35.457 回答