fix Closure mem leak
fix Closure mem leak

walkor/shadowsocks-php,lyhiving/shadowsocks-php,54Pany/shadowsocks-php,xurongsz/shadowsocks-php,cmhc/shadowsocks-php,hxdyxd/shadowsocks-php,srsman/shadowsocks-php,udo-tech-team/shadowsocks-php,luo3555/shadowsocks-php-bak,shinvdu/shadowsocks-php,noname007/shadowsocks-php