安全|函数
// 安全覆盖文件写入,防止写入失败文件丢失,如果您的代码中有以"w"模式写入文件的代码
// 推荐改用 f_xwrite() 的方式写入.
// $Id: f_xwrite.php,v 1.2 2004/12/03 05:27:04 hightman Exp $
function f_xwrite($fpath, $buf, $length = -1) {
$ret = 0;
if ($length if ($length == 0) {
@unlink($fpath);
return 1;
}
$fd = @fopen($fpath, "r+");
if (!$fd) $fd = @fopen($fpath, "w");
if (!$fd) return $ret;
flock($fd, LOCK_EX);
fseek($fd, 0, SEEK_SET);
if (fwrite($fd, $buf, $length)) {
ftruncate($fd, $length);
$ret = 1;
}
flock($fd, LOCK_UN);
fclose($fd);
return $ret;
}
?>

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