Filesystem 函数
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filetype

(PHP 4, PHP 5)

filetype — 取得文件类型

说明

string filetype ( string $filename )

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。

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 Supported Protocols and Wrappers以获得支持 stat() 系列函数功能的包装器列表。

Example #1 filetype() 例子

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

参见 is_dir()，is_file()，is_link()，file_exists()，stat() 和 mime_content_type()。

参数

filename

Path to the file.

返回值

Returns the type of the file. Possible values are fifo, char, dir, block, link, file, socket and unknown.

Returns FALSE if an error occurs. filetype() will also produce an E_NOTICE message if the stat call fails or if the file type is unknown.

范例

Example #2 filetype() example

<?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 Supported Protocols and Wrappers以获得支持 stat() 系列函数功能的包装器列表。

参见

Filesystem 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: 取得文件类型

用户评论:

holdoffhunger at gmail dot com (06-Apr-2012 03:23)

Something you may eventually want to do is to know the type of file simply by the suffix of the filename.  Functions like finfo_file and mime_ content_ type come close, but they don't actually list the filename suffix (like "txt" for "readme.txt"), and this filetype function seems to list "directory" or "file" only.

Knowing the filename suffix can be very useful, especially when managing a filesystem that has copies.  It's better to name the copy of a file as "readme(copy-1).txt" rather than "readme.txt(copy-1)", since the latter option probably isn't going to cooperate so well with your text editor/reader.  Here's a little code below that returns the suffix of a filename in a string.  It returns both the prefix and the suffix of the filename :

<?php

        // Example Filename: "Homepage.php"
        // ------------------------------------

    $file_name = "Homepage.php";

        // Filename Data
        // ------------------------------------

    $length_of_filename = strlen($file_name);
    $last_char = substr($file_name, $length_of_filename - 1, 1);

        // Parse Filename Backwards
        // ------------------------------------
   
    for($i_parse_name = 0; $i_parse_name < $length_of_filename; $i_parse_name++)
    {

            // Gather Data and Detect
            // ------------------------------------
       
        $last_char = substr($file_name, $length_of_filename - $i_parse_name + 2, 1);
       
        if($last_char == ".")
        {
            $filename_suffix = substr($file_name, $length_of_filename - $i_parse_name + 2, $i_parse_name);
            $filename_prefix = substr($file_name, 0, $length_of_filename - strlen($filename_suffix));
            $i_parse_name = $length_of_filename;
        }
    }
   
        // Print Results
        // ------------------------------------
               
    print("Filetype Results -- $filename_prefix ||| $filename_suffix");

        // Example Results:
        // ------------------------------------
        //    Filetype Results -- Homepage ||| .php

?>

Other examples:

"Best.Page.in.the.Universe.xml"
    Filetype Results -- Best.Page.in.the.Universe ||| .xml

"Best.Page.in.the.Universe.xml5789"
    Filetype Results -- Best.Page.in.the.Universe ||| .xml5789

"Home.awesome.page.php"
    Filetype Results -- Home.awesome.page ||| .php

Abhi Jain (08-Jun-2011 08:01)

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.

adlerweb (07-Oct-2010 09:09)

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",...)

7r6ivyeo at mail dot com (22-Nov-2008 01:29)

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.

ruach at chpc dot utah dot edu (11-Mar-2004 01:11)

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