/**
* Tries to get the system directory for temporary files. First
* $wgTmpDirectory is checked, and then the TMPDIR, TMP, and TEMP
* environment variables are then checked in sequence, then
* sys_get_temp_dir(), then upload_tmp_dir from php.ini.
*
* NOTE: When possible, use instead the tmpfile() function to create
* temporary files to avoid race conditions on file creation, etc.
*
* @return string
*/
function wfTempDir()
{
global $wgTmpDirectory;
if ($wgTmpDirectory !== false) {
return $wgTmpDirectory;
}
return TempFSFile::getUsableTempDirectory();
}