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Hi,
I want change of user country code ?
i try that !
ex:

if (equali(country, "DZA"))  
     {
     format(strb,32,"%s[%s]",username,"USB")
     }  

but (

public check_name(id,username[])
{    
     get_user_ip(id, playerip, 16, 1) 
     if(geoip_code3(playerip,country)){ 
     format(stra,4,"[%s]",country) 
     if (contain(username,stra) == -1){
     geoip_code3(playerip,country) 
     format(strb,32,"%s[%s]",username,country)
     if (equali(country, "DZA"))  
     {
     format(strb,32,"%s[%s]",username,"USB")
     }
     set_user_info(id,"name",strb) 
      } 
   } 
   return PLUGIN_CONTINUE 
}  

_________________
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Your code formatting is very bad. This is how it should look:

public check_name(id,username[])
{    
   get_user_ip(id, playerip, 16, 1) 
   if (geoip_code3(playerip, country))
   {
      format(stra,4,"[%s]", country) 
      if (contain(username, stra) == -1)
      {
         geoip_code3(playerip, country) 
         format(strb,32,"%s[%s]", username, country)
         if (equali(country, "DZA"))  
         {
            format(strb,32,"%s[%s]", username, "USB")
         }
         set_user_info(id,"name", strb) 
      } 
   } 
   return PLUGIN_CONTINUE 
}

In future posts try to follow good formatting or your examples are too hard to understand.

      format(stra,4,"[%s]", country) 
      if (contain(username, stra) == -1)

You think you bail out if country code contained in the user name, but you forgot that you change country code later to "USB", so user with name "Player [USB]" will never match here, so country code will be added again. Could be so:

      format(stra,4,"[%s]", country) 
      if (contain(username, stra) == -1 && contain(username, "[USB]") == -1)

Also your code has some redundancy and errors. Here how it should be:

public check_name(id,username[])
{
   new stra[32], strb[32];
   get_user_ip(id, playerip, 16, 1)
   if (geoip_code3(playerip, country))
   {
      if (equali(country, "DZA"))
         copy(stra, charsmax(stra), "[USB]");
      else
         format(stra, 5, "[%s]", country);   // formatted length limited to 5
      if (contain(username, stra) == -1)
      {
         // You should limit username first, because you add country code to the end. Cut 5 letters
         username[27] = 0;
         format(strb, charsmax(strb), "%s%s", username, stra);
         set_user_info(id, "name", strb);
      } 
   } 
   return PLUGIN_CONTINUE;
}