sys_get_temp_dir()

(PHP 5 >= 5.2.1, PHP 7)

返回用于临时文件的目录

说明

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

Example #1sys_get_temp_dir()例子

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

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.

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.

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

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

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

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

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

Within this config it still returns /tmp

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

And then running:
php test.php
   /tmp
  
TMPDIR=/custom/location php test.php
  /custom/location

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

using in windows this trim spaces and add ~1

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). 

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