laravel 从文件名中删除特殊字符
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Removing special characters from filename
提问by Eieur Geir Vilhelmsson
I'm making a website where people can upload images. However when end-users are uploading an image that contains special characters or a foreign character, the image does upload, But It cannot be display'd on the website, Like the image doesn't exist on the server.
我正在制作一个人们可以上传图片的网站。但是当最终用户上传包含特殊字符或外来字符的图片时，图片确实上传了，但无法在网站上显示，就像该图片在服务器上不存在一样。
I see a lot of people answering on another post saying that I need to use preg_replace
我看到很多人在另一个帖子上回答说我需要使用 preg_replace
But the thing is, I don't really know how to use it. How would I use it in my code.
但问题是，我真的不知道如何使用它。我将如何在我的代码中使用它。
Here is my controller method:
这是我的控制器方法：
public function upload(Requests\CreatePostsRequest $request)
{
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES['fileToUpload']["name"]);
$uploadOk = 1;
$findme = ".";
$pos = strpos($target_file, $findme);
//echo $target_file;
//dd($_POST);
echo ini_get('upload_max_filesize');
echo $_FILES["fileToUpload"]["error"];
$imageFileType = strtolower(substr($target_file,$pos+1));
if(isset($_POST["submit"])) {
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
//$check = true;
//dd($check);
if($check !== false) {
echo "File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
} else {
echo "File is not an image.";
$uploadOk = 0;
}
}
$filecheck = 0;
$orgFileName = $target_file;
while (file_exists($target_file)) {
$target_file = substr($orgFileName,0,$pos).$filecheck.substr($orgFileName,$pos);
$filecheck++;
$uploadOk = 1;
}
if ($_FILES["fileToUpload"]["size"] > 500000000*8) {
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
echo $imageFileType;
$uploadOk = 0;
}
if ($uploadOk == 0) {
echo "Sorry, your file was not uploaded.";
} else {
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
$post = new Posts($request->all());
$post->fileToUpload = $target_file;
Auth::user()->posts()->save($post);
} else {
echo "Sorry, there was an error uploading your file.";
}
}
return redirect('');
echo $target_file;
}
回答by Magnus Eriksson
Using preg replace:
使用 preg 替换：
$target_file = $target_dir . preg_replace("/[^a-z0-9\_\-\.]/i", '', basename($_FILES['fileToUpload']["name"]));
This will remove all characters that's not a letter (a-z), a number (0-9) or a dash, underscore or dot (we want to keep the file extension). The iflag in the end makes the match case insensitive.
这将删除所有不是字母 (az)、数字 (0-9) 或破折号、下划线或点（我们希望保留文件扩展名）的字符。最后的i标志使匹配不区分大小写。
Update
更新
To make the expression shorter, you can replace a-z0-9\_-part with the word token \w.
The pattern would then be: /[^\w\-\.]/. Here we don't need the iflag, since the word token handles that for us.
为了使表达式更短，您可以将a-z0-9\_-part替换为单词 token \w。
模式将是：/[^\w\-\.]/。这里我们不需要i标志，因为单词 token 为我们处理了这个问题。
