仅允许图像上传器 PHP 脚本中的图像和 PDF 类型

Question

我有一个脚本，它只允许上传 1 张图片，效果很好。

但现在它允许上传任何和所有类型。

如何只允许 jpg、jpeg、gif、png 和 PDF 文件作为唯一允许上传的文件？

这是我的代码的一部分。

<?php  

// 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
$uploadsDirectory = $_SERVER['DOCUMENT_ROOT'] . $directory_self . 'uploaded_files/';

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

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

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

//echo'<pre>';print_r($_FILES);exit;

// Now let's deal with the uploaded files

// 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 needed', $uploadForm);

// check if any files were uploaded and if 
// so store the active $_FILES array keys
$active_keys = array();
foreach($_FILES[$fieldname]['name'] as $key => $filename)
{
if(!empty($filename))
{
$active_keys[] = $key;
}
}

// check at least one file was uploaded
if (count($active_keys) < 1)
{ echo "<table border=\"0\" cellspacing=\"4\" cellpadding=\"4\"  style=\"border: 1px solid black; text-align: center; font-family: arial; font-size: 14px;\" width=\"600px\" align=\"center\">
<tr>
<td>
<font size=\"3\" color=\"red\"><strong><u>Upload Error</u></strong></font>
<br>
<br>
<b>You must upload one file.</b>
<br><br>
<a href=\"javascript: history.go(-1)\">Back to upload form</a>
<br>
</td>
</tr>
</table> <div style=\"display: none;\"> ";  }
//count($active_keys)
//or error('No files were uploaded', $uploadForm);

// check for standard uploading errors
foreach($active_keys as $key)
{
($_FILES[$fieldname]['error'][$key] == 0)
or error($_FILES[$fieldname]['tmp_name'][$key].': '.$errors[$_FILES[$fieldname]['error'][$key]], $uploadForm);
}

// check that the file we are working on really was an HTTP upload
foreach($active_keys as $key)
{
@is_uploaded_file($_FILES[$fieldname]['tmp_name'][$key])
or error($_FILES[$fieldname]['tmp_name'][$key].' not an HTTP upload', $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
foreach($active_keys as $key)
{
$now = time();
while(file_exists($uploadFilename[$key] = $uploadsDirectory.$now.'-'.$_FILES[$fieldname]['name'][$key]))
{
$now++;
}
}

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

// If you got this far, everything has worked and the file has been successfully saved.
// We are now going to redirect the client to the success page.


if($_FILES['file']['error'] === UPLOAD_ERR_INI_SIZE) {
    // Handle the error
    echo 'Your file is too large.';
    die();
}
// make an error handler which will be used if the upload fails
function error($error, $location, $seconds = 5)
{
echo "<table border=\"0\" cellspacing=\"4\" cellpadding=\"4\"  style=\"border: 1px solid black; text-align: center; font-family: arial; font-size: 14px;\" width=\"600px\" align=\"center\">
<tr>
<td>
<font size=\"3\" color=\"red\"><strong><u>Upload Error</u></strong></font>
<br>
<br>
<!--<b>Your proof is not a supported filetype.<br>
Please upload an image (jpg, gif, png, bmp file) or PDF file.
<br>
<br>
or</b>
<br>
<br>-->
<b>Your File Size is bigger then the maximum allowed - 2 MB.<br>
Please upload a smaller file.</b>
<br><br>
<a href=\"javascript: history.go(-1)\">Back to upload form</a>
<br>
</td>
</tr>
</table> <div style=\"display: none;\">";
}
/*
{
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
*/

// < input id="file1" name="file[]" type="file" style="border: 1px solid white;">
//$fi= $_POST['file[]'];
//$fi = "(0)";

$fi = array($_FILES['file']['name']['0'],$_FILES['file']['name']['1'],$_FILES['file']['name']['2']);

====编辑====

我能够让它只允许图片，但现在我如何允许上传 PDF？

我将此代码添加到我的脚本中。

foreach($active_keys as $key)
{
@getimagesize($_FILES[$fieldname]['tmp_name'][$key])
or error($_FILES[$fieldname]['tmp_name'][$key].' not an image', $uploadForm);
}    

Answer 1

刚刚在您的代码中附加了以下行。它会在移动到目录之前检查上传文件是图像还是 pdf。

$allowedExts = array("gif", "jpeg", "jpg", "png", "pdf");

$temp = explode(".", $_FILES["file"]["name"]);

$extension = end($temp);


if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/jpg")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "image/x-png")
|| ($_FILES["file"]["type"] == "image/png")
|| ($_FILES["file"]["type"] == "application/pdf") 
&& in_array($extension, $allowedExts)) {
    // put the upload code here
} else {
      // put error message here
}

Answer 2

我可以通过下面的代码实现这一点。

$thefilename = $_FILES["file"]["name"][0];
/* first, check for suffix
(jpg, gif, png, bmp file) or PDF file */
$thefilesuffix = substr($thefilename, -3);
// echo "<p>".$thefilesuffix."</p><hr />";

switch($thefilesuffix)
{
case "pdf": case "PDF":
/* don't need to do anything special, 
but notice the capitalized versions */
break;

case "jpg": case "gif": case "png": case "bmp": 
case "JPG": case "GIF": case "PNG": case "BMP":
//ALLOWS ONLY IMAGES TO BE UPLOADED
foreach($active_keys as $key)
{
@getimagesize($_FILES[$fieldname]['tmp_name'][$key])
or error($_FILES[$fieldname]['tmp_name'][$key].' not an image', $uploadForm);
}   
//ALLOWS ONLY IMAGES TO BE UPLOADED
break;

default:
echo "<table border=\"0\" cellspacing=\"4\" cellpadding=\"4\"  style=\"border: 1px solid black; text-align: center; font-family: arial; font-size: 14px;\" width=\"600px\" align=\"center\">
<tr>
<td>
<font size=\"3\" color=\"red\"><strong><u>Upload Error</u></strong></font>
<br>
<br>
<b>Your proof must be an an image (jpg, gif, png, bmp file) or PDF file.<br>
Please upload a different file.</b>
<br>
<br>
<a href=\"javascript: history.go(-1)\">Back to upload form</a>
<br>
</td>
</tr>
</table> <div style=\"display: none;\">"; exit;
break;
}