Assistance with a class method in PHP -

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i trying make function can pass mysql query , result or error, should check see if user running code admin, if session variable holds number count of mysql queries ran on page , increment 1 number , set session, if user admin show error messages.

i know not best code appear should work? tips improve please.

you can see running method gets session variables value, set variable in current method, increment it's value 1 number , run setter method save session again. not sure if correct way of doing that? need run methods , save them local variable am?

also getting error

fatal error: using $this when not in object context in c:\webserver\htdocs\project2\includes\classes\database.class.php on line 37

line 37 

$this->user_role = $session->get('user_role');

method...

public static function query($sql) {     global $session; // $session object      //get session value see if user admin     $this->user_role = $session->get('user_role');      //if user admin, query counter session value , +1 , reset session variable.     if ($this->user_role >= 9){         $this->querie_counter = $session->get('querie_counter');         $this->querie_counter++; // add +1 number         $session->set('querie_counter',$this->querie_counter)     }      //run mysql query     $result = mysql_query($sql);      if (!$result) {         // if admin viewing show sql code , error returned         if($this->user_role >= 9){             $error = '<br><center><font size="+1" face="arial" color="red">an internal error has occurred.<br> error has been recorded review</font></center><br>';             $sql_formatted = highlight_string(stripslashes($sql), true);             $error .= '<b>the mysql syntax used</b><br>' . $sql_formatted .             '<br><br><b>the mysql error returned</b><br>' . mysql_error();         }         die($error);     }     return $result; }

hmm no 1 has read error or?

**fatal error: using $this when not in object context in c:\webserver\htdocs\project2\includes\classes\database.class.php on line 37**

ok cant use $this in static function have use self::users

public static function query($sql) {     global $session; // $session object      //get session value see if user admin     self::user_role = $session->get('user_role');      //if user admin, query counter session value , +1 , reset session variable.     if (self::user_role >= 9){         self::querie_counter = $session->get('querie_counter');         self::querie_counter++; // add +1 number         $session->set('querie_counter',$this->querie_counter)     }      //run mysql query     $result = mysql_query($sql);      if (!$result) {         // if admin viewing show sql code , error returned         if(self::user_role >= 9){             $error = '<br><center><font size="+1" face="arial" color="red">an internal error has occured.<br> error has been recorded review</font></center><br>';             $sql_formatted = highlight_string(stripslashes($sql), true);             $error .= '<b>the mysql syntax used</b><br>' . $sql_formatted .             '<br><br><b>the mysql error returned</b><br>' . mysql_error();         }         die($error);     }     return $result; }

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