filetype()

(PHP 4, PHP 5, PHP 7)

取得文件类型

说明

filetype(string $filename): string

返回文件的类型。

参数

$filename: 文件的路径。

返回值

返回文件的类型。可能的值有 fifo，char，dir，block，link，file 和 unknown。

如果出错则返回FALSE。如果 stat 调用失败或者文件类型未知的话filetype()还会产生一个E_NOTICE消息。

范例

Example #1filetype()例子

<?php
echo filetype('/etc/passwd');  // file
echo filetype('/etc/');        // dir
?>

错误／异常

失败时抛出E_WARNING警告。

注释

Note:此函数的结果会被缓存。参见clearstatcache()以获得更多细节。

Tip

自 PHP 5.0.0 起,此函数也用于某些URL 包装器。请参见支持的协议和封装协议以获得支持stat()系列函数功能的包装器列表。

参见

is_dir() 判断给定文件名是否是一个目录
is_file() 判断给定文件名是否为一个正常的文件
is_link() 判断给定文件名是否为一个符号连接
file_exists() 检查文件或目录是否存在
mime_content_type() 检测文件的 MIME 类型
pathinfo() 返回文件路径的信息
stat() 给出文件的信息

There are 7 values that can be returned. Here is a list of them and what each one means
block: block special device
char: character special device
dir: directory
fifo: FIFO (named pipe)
file: regular file
link: symbolic link
unknown: unknown file type

filetype() does not work for files >=2GB on x86 Linux. You can use stat as a workarround:
$type=trim(`stat -c%F $file`);
Note that stat returns diffenerent strings ("regular file","directory",...)

Putting @ in front of the filetype() function does not prevent it from raising a warning (Lstat failed), if E_WARNING is enabled on your error_reporting.
The most common cause of filetype() raising this warning and not showing a filetype() in the output (it actually returns NULL) is, if you happened to pass just the 'Dir or File Name' and not the complete "Absolute or Relative Path" to that 'file or Dir'. It may still read that file and return its filetype as "file" but for Dir's it shows warning and outputs NULL.
eg:
$pathToFile = '/var/www';
$file = 'test.php';
$dir = 'somedir';
Output for filetype($file) will be returned as 'file' and possibly without any warning, but for filetype($dir), it will return NULL with the warning "Lstat failed", unless you pass a complete path to that dir, i.e. filetype($pathToFile.'/'.$dir).
This happened to me and found this solution after a lot of trial and error. Thought, it might help someone.

Note there is a bug when using filetype with for example Japanese filenames :
https://bugs.php.net/bug.php?id=64699
The whole PHP interpreter comes crashing down without anyway to avoid it or capture an exception.

I use the CLI version of PHP on Windows Vista. Here's how to determine if a file is marked "hidden" by NTFS:
<?php
function is_hidden_file($fn) {
  $attr = trim(exec('FOR %A IN ("'.$fn.'") DO @ECHO %~aA'));
  if($attr[3] === 'h')
    return true;
  return false;
}
?>
Changing <?php if($attr[3] === 'h') ?> to <?php if($attr[4] === 's') ?> will check for system files.
This should work on any Windows OS that provides DOS shell commands.

/* COPY/PASTE */
<?php
//https://php.net/manual/de/function.filetype.php#104308 
echo "Zum testen müssen tatsächlich existente Namen verwendet werden.<br>";
echo "Pfad und Dateiname müssen getrennt eingetragen und durch einen Punkt verbunden sein.<br>";
echo "Example: [filetype(\"../dir/u_dir/\".\"temp.jpg\")] liefert -> file<br>";
?>