Preferences->package setting->phpfmt->setting-user

将代码复制到里面：

{
    "enable_auto_align": false,
    "indent_with_space": false,
    "passes":
    [
        "OnlyOrderUseClauses",
        "ReindentSwitchBlocks"
    ],
    "psr1": true,
    "psr1_naming": false,
    "psr2": true,
    "version": 2
}

保存时就会自己格式化。