PHP - Manual: sys_get_temp_dir

2024-12-22

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sys_get_temp_dir

(PHP 5 >= 5.2.1, PHP 7, PHP 8)

sys_get_temp_dir — 返回用于临时文件的目录

说明

sys_get_temp_dir(): string

返回 PHP 储存临时文件的默认目录的路径。

返回值

返回临时目录的路径。

范例

示例 #1 sys_get_temp_dir() 例子


<?php
// 使用 sys_get_temp_dir() 在目录里创建临时文件
$temp_file = tempnam(sys_get_temp_dir(), 'Tux');

echo $temp_file;
?>

以上例程的输出类似于：

C:\Windows\Temp\TuxA318.tmp

参见

tmpfile() - 建立一个临时文件
tempnam() - 建立一个具有唯一文件名的文件

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User Contributed Notes 12 notes

down

OsakaWebbie ¶

5 years ago


If running on a Linux system where systemd has PrivateTmp=true (which is the default on CentOS 7 and perhaps other newer distros), this function will simply return "/tmp", not the true, much longer, somewhat dynamic path.

down

royanee at yahoo dot com ¶

8 years ago


As of PHP 5.5.0, you can set the sys_temp_dir INI setting so that this function will return a useful value when the default temporary directory is not an option.

down

Anonymous ¶

14 years ago


This function does not always add trailing slash. This behaviour is inconsistent across systems, so you have keep an eye on it.

down

Ismail Asci ¶

8 years ago


It's not documented but this function does not  send the path with trailing spaces, actually it drops the slash if it exists.

https://github.com/php/php-src/blob/af6c11c5f060870d052a2b765dc634d9e47d0f18/main/php_open_temporary_file.c#L238

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Anonymous ¶

7 years ago


it should be mentioned that the return value of sys_get_temp_dir() can be set using the ini-directive 'sys_temp_dir' globally as well as per directory by using
php_admin_value sys_temp_dir /path/to/tmp

down

Nimja ¶

6 years ago


A very helpful thing to note when on Linux:

If you are running PHP from the commandline you can use the environment variable: TMPDIR - to change the location without touching php.ini. - This should work on most versions of PHP.

Example file: test.php
<?php
    echo sys_get_temp_dir() . PHP_EOL;
?>

And then running:

php test.php
     /tmp
    
TMPDIR=/custom/location php test.php
    /custom/location

down

ohcc at 163 dot com ¶

5 years ago


when the sys_temp_dir directive is left unset, sys_get_temp_dir() returns C:\Windows on my Windows.

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bert-jan at bugbyte dot nl ¶

12 years ago


This function does not account for virtualhost-specific modifications to the temp path and/or open_basedir:

<Virtualhost>
php_admin_value open_basedir /home/user
php_admin_value upload_tmp_dir /home/user/tmp
php_admin_value session.save_path /home/user/tmp
</Virtualhost>

Within this config it still returns /tmp

down

Arthur Clifford ¶

2 years ago


That is important for the purposes of building paths through concatenation to know that sys_get_temp_dir does not include a path separator at the end.

So, sys_get_temp_dir() will return whatever your temp dir is set to, by default:

/tmp

If you attempted to concatenate another dir name  temp and use the following:

mkdir(sys_get_temp_dir() . 'some_dir');

That would actually attempt to generate:
/tmpsome_dir

It would likely result in a permission error unless you are running a php script as a super user.

Instead you would want to do:
mkdir( sys_get_temp_dir() . DIRECTORY_SEPARATOR. 'some_dir' );

which would create:
/tmp/some_dir

I don't know if Windows or other platforms include a directory separator at the end. So if you are writing something a bit more general you may want to check for the path separator at the end and if it is not there append it.

down

-1

Anonymous ¶

1 year ago


On windows, when PHP is used as CLI, this function will return the temp directory for the current user e.g. C:\Users\JohnSmith\AppData\Local\Temp\9 instead of C:\Windows\Temp.

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-5

besabellacyrus at gmail dot com ¶

2 years ago


using in windows this trim spaces and add ~1

down

-57

dannel at aaronexodus dot com ¶

12 years ago


There's no need to use a random name for the directory for tempnam.


Since a file and a directory can't share the same name on the filesystem, we can exploit this and simply use the name of the current file. It is guaranteed that the directory won't exist (because it's a file, of course).


<?php

if ( !function_exists('sys_get_temp_dir')) {

  function sys_get_temp_dir() {

    if (!empty($_ENV['TMP'])) { return realpath($_ENV['TMP']); }

    if (!empty($_ENV['TMPDIR'])) { return realpath( $_ENV['TMPDIR']); }

    if (!empty($_ENV['TEMP'])) { return realpath( $_ENV['TEMP']); }

    $tempfile=tempnam(__FILE__,'');

    if (file_exists($tempfile)) {

      unlink($tempfile);

      return realpath(dirname($tempfile));

    }

    return null;

  }

}

?>

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官方地址：https://www.php.net/manual/en/function.sys-get-temp-dir.php

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sys_get_temp_dir

说明

返回值

范例

参见

User Contributed Notes 12 notes