如何确定 Laravel 5.2 的公共目录中存在文件
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How to determine file exist in public directory for Laravel 5.2
提问by Misterk
I have some image files in public/image directory, so I want to determine if a file exist in that directory before I save a new file. How to determine if a file exist?
我在 public/image 目录中有一些图像文件，所以我想在保存新文件之前确定该目录中是否存在文件。如何判断文件是否存在？
回答by Hammerbot
You can use the Storage Facade:
您可以使用存储外观：
Storage::disk('image')->exists('file.jpg'); // bool
If you are using the disk imageas shown above, you need to define a new disk in your config/filesystems.phpand add the following entry in your disksarray:
如果您使用image如上所示的磁盘，则需要在您的磁盘中定义一个新磁盘config/filesystems.php并在您的disks阵列中添加以下条目：
'image' => [
'driver' => 'local',
'root' => storage_path('app/public/image'),
'visibility' => 'public',
],
Here is the documentation if you want to know more on that Facade: https://laravel.com/docs/5.2/filesystem
如果您想了解有关该 Facade 的更多信息，请参阅以下文档：https: //laravel.com/docs/5.2/filesystem
Hope it helps :)
希望能帮助到你 ：）
回答by John Slegers
You could use Laravel's storage Facade as El_Matellasuggested. However, you could also do this pretty easily with "vanilla"PHP, using PHP's built-in is_file()function :
您可以按照El_Matella 的建议使用 Laravel 的存储外观。但是，您也可以使用 PHP 的内置函数使用“vanilla”PHP轻松完成此操作is_file()：
if (is_file('/path/to/foo.txt')) {
/* The path '/path/to/foo.txt' exists and is a file */
} else {
/* The path '/path/to/foo.txt' does not exist or is not a file */
}
回答by AmirRezaM75
file_exists(public_path($name)
file_exists(public_path($name)
here is my solution to check if file exists before downloading file.
这是我在下载文件之前检查文件是否存在的解决方案。
if (file_exists(public_path($name)))
return response()->download(public_path($name));
回答by oseintow
You can use this little utility to check if the directory is empty.
您可以使用这个小实用程序来检查目录是否为空。
if($this->is_dir_empty(public_path() ."/image")){
\Log::info("Is empty");
}else{
\Log::info("It is not empty");
}
public function is_dir_empty($dir) {
if (!is_readable($dir)) return NULL;
$handle = opendir($dir);
while (false !== ($entry = readdir($handle))) {
if ($entry != "." && $entry != "..") {
return FALSE;
}
}
return TRUE;
}
