Security function in a class

Can you think of a conceptual algorithm to solve your problem? I don't think so..
If i got you correctly, something like ob_start() on inclusion, and later (maybe using register_shutdown_function()) check with ob_get_contents(), if your link is somewhere inside there..should be what you want.
Also try striptags() to remove comments, so they don't add your link inside <!-- and -->, and other output buffer control functions to modify it..

class yeah {

 function test() {
 echo "test";
 }

 function bla() {
 echo "bla";
 }
}

$my = new yeah;
$my->bla();

Think this should work.

Sorry, posted at the wrong post.

New to exepert exchange.

ThG,

I am fairly new to php and using its functions...could you put it in a more simple manner, or send me in the direction of a tutorial that could help me work it out myself?

Cheers

-OBCT

OBCT: explain me again, more technically and more strictly what you want to do. Then, read carefully the man pages for each function i mentioned, and if you can't understand the man page go back to the basic syntax chapter.

http://www.php.net/ob_start
http://www.php.net/register_shutdown_function

At the bottom of all my php pages, it has who wrote the script, the company name and copyright information. I want to be able to put a function in my class, that checks that the information is on all the pages, so if that text gets removed by a user, an error will print on the page saying that the page must contain the copyright information.
I had a look at those functions, then I checked the basic syntax but I don't know how I would use those functions in my scripts.

Cheers

-OBCT

how your code look like? i'll try to write a few proof of concept lines

<?php

class DB
{
      
    var $dbhost = "localhost";      
      var $dblogin = "";
      var $dbpass = "";
      var $dbname = "";
      var $dblink;      
      var $queryid;      
      var $error = array();      
      var $record = array();            
      var $totalrecords;      
      var $last_insert_id;                        

      function get_dbhost()
    {
        return $this->dbhost;
    }

      function get_dblogin()
    {
        return $this->dblogin;
    }

      function get_dbpass()
    {
        return $this->dbpass;
    }

      function get_dbname()
    {
        return $this->dbname;
    }

      function set_dbhost($value)
      {
          return $this->dbhost = $value;
      }

      function set_dblogin($value)
    {
        return $this->dblogin = $value;
    }

      function set_dbpass($value)
    {
        return $this->dbpass = $value;
    }

      function set_dbname($value)
    {
        return $this->dbname = $value;
    }


      function DB($dblogin, $dbpass, $dbname)
    {
        $this->set_dblogin($dblogin);
            $this->set_dbpass($dbpass);
            $this->set_dbname($dbname);
    }

      function connect()
    {
        $this->dblink = @mysql_pconnect($this->dbhost, $this->dblogin, $this->dbpass);
            if(!$this->dblink)
            {
                  $this->return_error("Unable to connect to the database.");
            }
            $t = @mysql_select_db($this->dbname, $this->dblink);
            if(!$t)
            {
                  $this->return_error("Unable to change databases.");
            }
            return $this->dblink;

    }


      function disconnect()
    {
        if($this->dblink)
            {      
                  $test = @mysql_close($this->dblink);
                  if(!$test)
                  {
                        $this->return_error("Unable to close the connection.");
                  }
            }
            else
            {
                $this->return_error("No connection open.");
            }
            unset($this->dblink);
    }


      function return_error($message)
      {
            return $this->error[] = $message." ".mysql_error().".";
      }


      function showErrors()
    {
        if($this->hasErrors())
            {
                  reset($this->error);
                  $errcount = count($this->error);
                  echo "<p>Error(s) found: <b>'$errcount'</b></p>\n";

                  while(list($key, $val) = each($this->error))
                  {
                        echo "<li>$val</li><br>\n";
                  }
                  $this->resetErrors();
            }
    }


      function hasErrors()
    {
        if(count($this->error) > 0)
            {
                  return true;
            }
            else
            {
                  return false;
            }
    }


      function resetErrors()
    {
        if($this->hasErrors())
            {
                  unset($this->error);
                  $this->error = array();
            }
    }


      function query($sql)
    {
            if(empty($this->dblink))
            {      
                  $this->connect();
            }
        $this->queryid = @mysql_query($sql, $this->dblink);
            if(!$this->queryid)
            {
                  $this->return_error("Unable to perform the query <b>'$sql'</b>.");
            }
            return $this->queryid;
    }


      function fetchRow()
    {
            if(isset($this->queryid))
            {
              return $this->record = @mysql_fetch_array($this->queryid);
            }
            else
            {
                  $this->return_error("No query specified.");
            }
    }


      function fetchLastInsertId()
      {
            $this->last_insert_id = @mysql_insert_id($this->dblink);
            if(!$this->last_insert_id)
            {
                  $this->return_error("Unable to get the last inserted id from MySQL.");
            }
            return $this->last_insert_id;
      }


      function resultCount()
    {
        $this->totalrecords = @mysql_num_rows($this->queryid);
            if(!$this->totalrecords)
            {
                  $this->return_error("Unable to count the number of rows returned");
            }
            return $this->totalrecords;
    }


      function resultExist()
    {
            if(isset($this->queryid) && ($this->resultCount() > 0))
            {
                  return true;
            }
            return false;
    }


      function clear($result = 0)
    {
            if($result != 0)
            {
                  $t = @mysql_free_result($result);
                  if(!$t)
                  {
                        $this->return_error("Unable to free the results from memory");
                  }
            }
            else
            {
                  if(isset($this->queryid))
                  {
                        $t = @mysql_free_result($this->queryid);
                        if(!$t)
                        {
                              $this->return_error("Unable to free the results from memory (internal).");
                        }
                  }
                  else
                  {
                      $this->return_error("No SELECT query performed, so nothing to clear.");
                  }
            }
      }

}

?>

Modify your class as follows....

class DB {
......... lots of functions cut ..............

   function DB($dblogin, $dbpass, $dbname)
    {
          $this->set_dblogin($dblogin);
          $this->set_dbpass($dbpass);
          $this->set_dbname($dbname);

          // requires you to change the function def as follows  
          //      function DB($dblogin, $dbpass, $dbname, $hostname)
          if ($_SERVER["SERVER_NAME"] <> $hostname) {
             die('Invalid Domain Name');
          }          
         // or the slightly less portable, harder to detect outside the class
          if ($_SERVER["SERVER_NAME"] <> "www.example.com") {
             die('Invalid Domain Name');
          }          

          // check "other things like that"
          if (not something else that must be ) {
             die('Something else is missing');
          }
    }
.......... lots more cut ................
}

That should do it.

Ah I see - I was thinking you didn't want the script taken from your site.  To check for the existence of a link in the output, you will need to scan the output buffer as ThG pointed out.  His code should work fine.