嗨，我
有一个允许用户上传 jpeg 的程序。 然后对文件执行一些操作。 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。 我不希望它那样。我要做的是即使没有上传文件，该过程也能继续。我该怎么做？下面是我的代码。我认为其中一部分是限制。我不知道在这里删除或更改哪个部分。请帮我发现我已经为此工作了好几天了。非常感谢。
// 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">' . $error . '...</span>'."'n'n".
' The upload form is reloading</p>'."'n'n".
' </div>'."'n'n".
'</html>';
exit;
} // end error handler
因此，与其使用上传的版本，不如使用单独的文件。
在您的代码中：
// check for standard uploading errors
($_FILES[$fieldname]['error'] == 0)
or error($errors[$_FILES[$fieldname]['error']], $uploadForm);
将其更改为以下内容：
// check for standard uploading errors
if($_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。