史上最全的PHP常用函数大全，不看看你就out了（还会不断更新哦！）_PHP教程

sub_str(, = 0, = = (); = ( ( == 0 || >= ( = + ( = (('mb_substr' = mb_substr(, 0, , (('iconv_substr' = (, 0, , = (, 0, ( && != .= '...' } View Code

2、获得用户的真实IP地址

= ( !== (( ((['HTTP_X_FORWARDED_FOR' = (',', ['HTTP_X_FORWARDED_FOR' ( = ( ( != 'unknown' = ((['HTTP_CLIENT_IP' = ['HTTP_CLIENT_IP'