linux set ulimit

for setting ulimit u need to run following command

ulimit -n  10000  for setting limit to 10000

for soft files  
ulimit -Sn  10000

and for hard files
ulimit -Hn 10000


do it individually for all users

and this setting will be vanished after system restart

virtual hosting in nginx

Virtual hosting in nginx is very simple :

see nginx.conf file 

one server block is generally available there .
see


server {
listen 80;
server_name _;

#charset koi8-r;

#access_log logs/host.access.log main;

location / {
   /root //html;
  index index.html index.htm index.php ;
}
}


this is default server setting. that means from all doamains this will work .

for virtual hosting define new server block 
 

:
server {
listen 80;
  server_name yourdomain.com;

#charset koi8-r;

#access_log logs/host.access.log main;

location / {
   /root /new_host;
  index index.html index.htm index.php ;
}
}





now settings have been changed

just restart nginx  and see
if traffic coming from  yourdomain.com  then it will point to /root/ new_host   directory .

else it will go to /root/html  directory and find related contents here.




thats it   . it was very simple



ask me if u want any further help .

php call method froma string with parameters

very simple way to do that 


function abcd($parameter)
{
     return ture ;
}

$meth_str="abcd('ab')";
$res = false;
        $abc = '$res';
        $check = <<<bcd
if($meth_str)
{
        $abc= true;
} else
{
        $abc=false;
}
bcd;

        eval($check.";");    ///   that means $res=true;
     

Hope it helps
if need further help  comment here 

php check if IP lies in IP Range

first write function to check ip range

function Iprange_testing($iprange, $iptocheck)
{

    $ip = $iptocheck;


        list ($ip1, $ip2) = explode('-', $iprange);
        $ips = Array($ip,$ip1,$ip2);
        // sort ips and check if client ip is middle one
        natsort($ips);

        $sorted=implode("-", $ips);
        $ips=explode("-", $sorted);

        $ipcheck = true;

        if ($ips[1]!=$ip)
        {

            $ipcheck=false;
        }
return $ipcheck ;
    }

Now call this method

$res1  = Iprange_testing('192.168.1.10-192.168.1.100', '192.168.1.50');  //returns ture
$res2  = Iprange_testing('192.168.1.10-192.168.1.100', '192.168.1.101');  //returns false