ip方法支持检测是否是正确的IP地址。支持IPv4和IPv6。
如果想要单独检测IPv4格式IP请使用Validator::ipv4()
如果想要单独检测IPv6格式IP请使用Validator::ipv6()
格式：
Validator::ip(值)
Validator::ipv4(值)
Validator::ipv6(值)
用法：
Validator::ip('127.0.0.1'); // true
Validator::ipv4('127.0.0.1'); // true
Validator::ipv6('127.0.0.1'); // false
Validator::ip('127.0.0.256'); // false
Validator::ipv4('127.0.0.256'); // false
Validator::ipv6('127.0.0.256'); // false
Validator::ip('::ffff:192.168.89.9'); // true
Validator::ipv4('::ffff:192.168.89.9'); // false
Validator::ipv6('::ffff:192.168.89.9'); // true
Validator::ip('0000:0000:0000:0000:0000:0000:c0a8:5909'); // true
Validator::ipv4('0000:0000:0000:0000:0000:0000:c0a8:5909'); // false
Validator::ipv6('0000:0000:0000:0000:0000:0000:c0a8:5909'); // true
Validator::ip('::'); // true
Validator::ipv4('::'); // false
Validator::ipv6('::'); // true
