Пример приложения, использующего встроенные фреймы для загрузки файла. (как в популярных файлообмениках, например RapidShare, Megaupload)
Следующие функции используются в данном примере:
move_uploaded_file - Перемещает загруженный файл в новое место
fopen - открывает файл
fwrite - записывает в открытый файл
fclose - закрывает файл
str_replace - заменяет строку поиска на строку замены
filesize - возвращает размер файла в байтах
filemtime - возвращает время последней модификации файла
<?php
$upload_dir = "/var/www/files/aeu"; // Directory for file storing
// filesystem path
$web_upload_dir = "/aeu"; // Directory for file storing
// Web-Server dir
/* upload_dir is filesystem path, something like
/var/www/htdocs/files/upload or c:/www/files/upload
web upload dir, is the webserver path of the same
directory. If your upload-directory accessible under
www.your-domain.com/files/upload/, then
web_upload_dir is /files/upload
*/
// testing upload dir
// remove these lines if you're shure
// that your upload dir is really writable to PHP scripts
$tf = $upload_dir.'/'.md5(rand()).".test";
$f = @fopen($tf, "w");
if ($f == false)
die("Fatal error! {$upload_dir} is not writable. Set 'chmod 777 {$upload_dir}'
or something like this");
fclose($f);
unlink($tf);
// end up upload dir testing
// FILEFRAME section of the script
if (isset($_POST['fileframe']))
{
$result = 'ERROR';
$result_msg = 'No FILE field found';
if (isset($_FILES['file'])) // file was send from browser
{
if ($_FILES['file']['error'] == UPLOAD_ERR_OK) // no error
{
$filename = $_FILES['file']['name']; // file name
move_uploaded_file($_FILES['file']['tmp_name'], $upload_dir.'/'.$filename);
// main action -- move uploaded file to $upload_dir
$result = 'OK';
}
elseif ($_FILES['file']['error'] == UPLOAD_ERR_INI_SIZE)
$result_msg = 'The uploaded file exceeds the upload_max_filesize directive in php.ini';
else
$result_msg = 'Unknown error';
// you may add more error checking
// see http://www.php.net/manual/en/features.file-upload.errors.php
// for details
}
// outputing trivial html with javascript code
// (return data to document)
// This is a PHP code outputing Javascript code.
// Do not be so confused ;)
echo '<html><head><title>-</title></head><body>';
echo '<script language="JavaScript" type="text/javascript">'."\n";
echo 'var parDoc = window.parent.document;';
// this code is outputted to IFRAME (embedded frame)
// main page is a 'parent'
if ($result == 'OK')
{
// Simply updating status of fields and submit button
echo 'parDoc.getElementById("upload_status").value = "file successfully uploaded";';
echo 'parDoc.getElementById("filename").value = "'.$filename.'";';
echo 'parDoc.getElementById("filenamei").value = "'.$filename.'";';
echo 'parDoc.getElementById("upload_button").disabled = false;';
}
else
{
echo 'parDoc.getElementById("upload_status").value = "ERROR: '.$result_msg.'";';
}
echo "\n".'</script></body></html>';
exit(); // do not go futher
}
// FILEFRAME section END
// just userful functions
// which 'quotes' all HTML-tags and special symbols
// from user input
function safehtml($s)
{
$s=str_replace("&", "&", $s);
$s=str_replace("<", "<", $s);
$s=str_replace(">", ">", $s);
$s=str_replace("'", "'", $s);
$s=str_replace("\"", """, $s);
return $s;
}
if (isset($_POST['description']))
{
$filename = $_POST['filename'];
$size = filesize($upload_dir.'/'.$filename);
$date = date('r', filemtime($upload_dir.'/'.$filename));
$description = safehtml($_POST['description']);
// Let's generate file information page
$html =<<<END
<html><head><title>{$filename} [uploaded by IFRAME Async file uploader]</title></head>
<body>
<h1>{$filename}</h1>
<p>This is a file information page for your uploaded file. Bookmark it, or send to anyone...</p>
<p>Date: {$date}</p>
<p>Size: {$size} bytes</p>
<p>Description:
<pre>{$description}</pre>
</p>
<p><a href="{$web_upload_dir}/{$filename}" style="font-size: large;">download file</a><br>
<a href="{$PHP_SELF}" style="font-size: small;">back to file uploading</a><br>
<a href="{$web_upload_dir}/upload-log.html" style="font-size: small;">upload-log</a></p>
<br><br>
</body></html>
END;
// save HTML
$f = fopen($upload_dir.'/'.$filename.'-desc.html', "w");
fwrite($f, $html);
fclose($f);
$msg = "File {$filename} uploaded,
<a href='{$web_upload_dir}/{$filename}-desc.html'>see file information page</a>";
// Save to file upload-log
$f = fopen($upload_dir."/upload-log.html", "a");
fwrite($f, "<p>$msg</p>\n");
fclose($f);
// setting result message to cookie
setcookie('msg', $msg);
// redirecting to the script main page
// we're doing so, to avoid POST form reposting
// this method of outputting messages is called 'flash' in Ruby on Rails
header("Location: http://".$_SERVER['HTTP_HOST'].$PHP_SELF);
exit();
// redirect was send, so we're exiting now
}
// retrieving message from cookie
if (isset($_COOKIE['msg']) && $_COOKIE['msg'] != '')
{
if (get_magic_quotes_gpc())
$msg = stripslashes($_COOKIE['msg']);
else
$msg = $_COOKIE['msg'];
// clearing cookie, we're not going to display same message several times
setcookie('msg', '');
}
?>
<!-- Beginning of main page -->
<html><head>
<title>IFRAME Async file uploader example</title>
</head>
<body>
<?php
if (isset($msg)) // this is special section for outputing message
echo '<p style="font-weight: bold;">'.$msg.'</p>';
?>
<h1>Upload file:</h1>
<p>File will begin to upload just after selection. </p>
<p>You may write file description, while you file is being uploaded.</p>
<form action="<?=$PHP_SELF?>" target="upload_iframe" method="post" enctype="multipart/form-data">
<input type="hidden" name="fileframe" value="true">
<!-- Target of the form is set to hidden iframe -->
<!-- From will send its post data to fileframe section of
this PHP script (see above) -->
<label for="file">text file uploader:</label><br>
<!-- JavaScript is called by OnChange attribute -->
<input type="file" name="file" id="file" onChange="jsUpload(this)">
</form>
<script type="text/javascript">
/* This function is called when user selects file in file dialog */
function jsUpload(upload_field)
{
// this is just an example of checking file extensions
// if you do not need extension checking, remove
// everything down to line
// upload_field.form.submit();
var re_text = /\.txt|\.xml|\.zip/i;
var filename = upload_field.value;
/* Checking file type */
if (filename.search(re_text) == -1)
{
alert("File does not have text(txt, xml, zip) extension");
upload_field.form.reset();
return false;
}
upload_field.form.submit();
document.getElementById('upload_status').value = "uploading file...";
upload_field.disabled = true;
return true;
}
</script>
<iframe name="upload_iframe" style="width: 400px; height: 100px; display: none;">
</iframe>
<!-- For debugging purposes, it's often useful to remove
"display: none" from style="" attribute -->
<br>
Upload status:<br>
<input type="text" name="upload_status" id="upload_status"
value="not uploaded" size="64" disabled>
<br><br>
File name:<br>
<input type="text" name="filenamei" id="filenamei" value="none" disabled>
<form action="<?=$PHP_SELF?>" method="POST">
<!-- one field is "disabled" for displaying-only. Other, hidden one is for
sending data -->
<input type="hidden" name="filename" id="filename">
<br><br>
<label for="photo">File description:</label><br>
<textarea rows="5" cols="50" name="description"></textarea>
<br><br>
<input type="submit" id="upload_button" value="save file" disabled>
</form>
<br><br>
<a href="<?=$web_upload_dir?>/upload-log.html">upload-log</a>
<br><br><br>
Example by <a href="http://samplecode.ru/">SampleCode</a>
</body>
</html>