If I understand correctly this is what you want..
PHP Code:
public Function()
{
new szArg[ 64 ], iCount;
formatex( szArg, charsmax( szArg ), "Hey^nDude^nWelcome^nto^nAlliedmods" )
while( containi( szArg, "^n" ) != 0 )
{
iCount++;
}
client_print(id, print_chat, "New lines counts %i", iCount )
}