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.
(PHP 5 >= 5.2.1, PHP 7)
sys_get_temp_dir — Returns directory path used for temporary files
Returns the path of the directory PHP stores temporary files in by default.
Returns the path of the temporary directory.
Example #1 sys_get_temp_dir() example
<?php
// Create a temporary file in the temporary
// files directory using sys_get_temp_dir()
$temp_file = tempnam(sys_get_temp_dir(), 'Tux');
echo $temp_file;
?>
The above example will output something similar to:
C:\Windows\Temp\TuxA318.tmp
As of PHP 5.5.0, you can set the sys_temp_dir INI setting so that this function will return a useful value when the default temporary directory is not an option.
This function does not always add trailing slash. This behaviour is inconsistent across systems, so you have keep an eye on it.
It's not documented but this function does not send the path with trailing spaces, actually it drops the slash if it exists.
https://github.com/php/php-src/blob/af6c11c5f060870d052a2b765dc634d9e47d0f18/main/php_open_temporary_file.c#L238
This function does not account for virtualhost-specific modifications to the temp path and/or open_basedir:
<Virtualhost>
php_admin_value open_basedir /home/user
php_admin_value upload_tmp_dir /home/user/tmp
php_admin_value session.save_path /home/user/tmp
</Virtualhost>
Within this config it still returns /tmp
A very helpful thing to note when on Linux:
If you are running PHP from the commandline you can use the environment variable: TMPDIR - to change the location without touching php.ini. - This should work on most versions of PHP.
Example file: test.php
<?php
echo sys_get_temp_dir() . PHP_EOL;
?>
And then running:
php test.php
/tmp
TMPDIR=/custom/location php test.php
/custom/location
it should be mentioned that the return value of sys_get_temp_dir() can be set using the ini-directive 'sys_temp_dir' globally as well as per directory by using
php_admin_value sys_temp_dir /path/to/tmp
There's no need to use a random name for the directory for tempnam.
Since a file and a directory can't share the same name on the filesystem, we can exploit this and simply use the name of the current file. It is guaranteed that the directory won't exist (because it's a file, of course).
<?php
if ( !function_exists('sys_get_temp_dir')) {
function sys_get_temp_dir() {
if (!empty($_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;
}
}
?>
<?php
$dir=sys_get_temp_dir();
?>
Fatal error: Call to undefined function sys_get_temp_dir() in C:\Program Files\EasyPHP 2.0b1\www\op_gestion\y_sys_get_temp_dir.php on line 2