Source for file core.write_file.php
Documentation is available at core.write_file.php
* write out a file to disk
* @param string $filename
* @param string $contents
* @param boolean $create_dirs
$_dirname = dirname($params['filename']);
if ($params['create_dirs']) {
$_params = array('dir' => $_dirname);
// write to tmp file, then rename it to avoid file locking race condition
$_tmp_file = tempnam($_dirname, 'wrt');
if (!($fd = @fopen($_tmp_file, 'wb'))) {
$_tmp_file = $_dirname . DIRECTORY_SEPARATOR . uniqid('wrt');
if (!($fd = @fopen($_tmp_file, 'wb'))) {
$smarty->trigger_error("problem writing temporary file '$_tmp_file'");
fwrite($fd, $params['contents']);
if (DIRECTORY_SEPARATOR == '\\' || !@rename($_tmp_file, $params['filename'])) {
// On platforms and filesystems that cannot overwrite with rename()
// delete the file before renaming it -- because windows always suffers
// this, it is short-circuited to avoid the initial rename() attempt
@rename($_tmp_file, $params['filename']);
@chmod($params['filename'], $smarty->_file_perms);
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