Php > Miscellaneous

Session class

Session class

<?php 


        HowToUse: 
            Methods: 
                    $foo = new my_session([bool Session_starten]);        <-- Declare a new object of the class. 
                                                                            Use "new my_session(true)" to start a session. 
                    $foo->start();                                        <-- Start a session. 
                    $foo->session([Session_id]);                        <-- Gives you the session_id. 
                                                                            If a session_id is passed to the method, a new session will be started, 
                                                                            using the given session_id (See PHP-function: session_id()) 
                    $foo->stats();                                        <-- Shows you information about the environment. (PHP-version, reg_globals) 
                    $foo->clear();                                        <-- Ends a session 
                    $foo->test_cookies();                                <-- Returns true if cookies are allowed, false if not. 
                                                                            Needs to be executed before any output is displayed. Because the page, needs 
                                                                            to be reloaded. 
                    $foo->show();                                        <-- Shows all variables in a session 
                    $foo->show_errors();                                <-- Shows you an error-log. (To check if theres something wrong with the values, 
                                                                            given to the set-method.) 
                    $foo->clear_errors();                                <-- Clears the error-log (No real use, but anyway) 
     
                    $foo->set();                                        <-- Registers a variable in a session. Values passed to the method, need to be: 
                                                                            A pair (or a number of pairs) of "Name => Value", or an Array where the key will be used as the var-name 
                                                                            and the value as the var-value. 
                                                                 
                                                                            Example: 
                                                                                $test = "text"; is to be registerd: 
                                                                                 
                                                                                    objekt->set(VarName, VarValue); 
                                                                                    $foo->set("test", $test); 
                                                                                    (It's the same as: $foo->set("test", "text");) 
                                                                                Another example: 
                                                                                    $foo->set("value1", 1, "value2", 4); 
                                                                                     
                                                                            Differences if register_globals = on/off: 
                                                                                Example: 
                                                                                    $foo = 1; 
                                                                                    $bar->set("foo", 2); 
                                                                                    echo "foo = " . $foo; 
                                                                                     
                                                                                    register_globals = on: 
                                                                                        Ausgabe: foo = 2; 
                                                                                    register_globals = off: 
                                                                                        Ausgabe: foo = 1; 
                                                                                     
                    $foo->get(["_ARRAY"]);                                <-- Get a variable from a Session. 
                                                                            If the string "_ARRAY" is passed, the method will return an Array with all session 
                                                                            variables. 
                                                                            Example: 
                                                                                You want $x to have the value of the session-var $bar: 
                                                                                    var = objekt->get(SessionVarName); 
                                                                                    $x = $foo->get("bar");     
    */ 
         
    class my_session{ 
        var $rg; 
        var $old; 
        var $s_id; 
        var $errors; 
                     
        function my_session($s = false){ 
            if(ini_get("register_globals")) $this->rg = true; 
            else $this->rg = false; 
             
            if(phpversion() <= "4.1.0")    $this->old = true; 
            else $this->old = false; 

            if($s == true) $this->start(); 
        } 

        function start(){ 
            session_start(); 
            $this->s_id = session_id(); 
        } 
         
        function sessionid($new_id = false){ 
            if(!$new_id) return $this->s_id; 
            else session_id($new_id); 
        } 
     
        function clear(){ session_destroy(); } 
         
        function set(){ 
            $v = func_get_args(); 

            if(is_array($v[0])){ 
                foreach($v[0] as $k => $value){ 
                    if($this->check_var_syntax($k)) $this->reg_vars($k, $value); 
                } 
            } else { 
                if(count($v) % 2){ 
                    $this->errors[] = "Variable '" . $v[count($v) - 1] . "' ignored"; 
                    array_pop($v); 
                } 
                 
                for($i = 0; $i < count($v); $i += 2){ 
                    if($this->check_var_syntax($v[$i])) $this->reg_vars($v[$i], $v[$i+1]); 
                } 
            } 
        } 
         
        function check_var_syntax($buff){ 
            if(preg_match("!^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$!i", $buff)) return true; 
            else { 
                $this->errors[] = "Variable '<i>" . $buff . "</i>' ignored,<br>wrong syntax"; 
                return false; 
            } 
        } 
         
        function reg_vars($n, $v){ 
            if($this->rg){ 
                $GLOBALS[$n] = $v; 
                session_register("$n"); 
            } else { 
                session_register("$n"); 
                if($this->old) $GLOBALS['HTTP_SESSION_VARS'][$n] = $v; 
                else $GLOBALS['_SESSION'][$n] = $v; 
            } 
        } 
         
        function get($buff){ 
            if($buff == "_ARRAY"){ 
                if($this->old) return $GLOBALS['HTTP_SESSION_VARS']; 
                else return $GLOBALS['_SESSION']; 
            } if($this->old) return $GLOBALS['HTTP_SESSION_VARS'][$buff]; 
            else return $GLOBALS['_SESSION'][$buff]; 
        } 

        function test_cookies(){ 
            if($this->old) $url = $GLOBALS['HTTP_SERVER_VARS']['PHP_SELF'] . "?" . $GLOBALS['HTTP_SERVER_VARS']['QUERY_STRING']; 
            else $url = $GLOBALS['_SERVER']['PHP_SELF'] . "?" . $GLOBALS['_SERVER']['QUERY_STRING']; 
             
            $start = $this->get("start"); 
             
            if($start > 0){ 
                switch($start){ 
                    case 1: 
                        setcookie("cookie", "1"); 
                        $this->set("start", 2); 
                        header("Location: $url"); 
                        break; 
                    case 2: 
                        if($this->old) ($GLOBALS['HTTP_COOKIE_VARS']['cookie']) ? ($cookies = true) : ($cookies = false); 
                        else ($GLOBALS['_COOKIE']['cookie']) ? ($cookies = true) : ($cookies = false); 
                        break;                 
                } 
            } else { 
                $this->set("start", 1); 
                header("Location: $url&PHPSESSID=" . session_id()); 
            } 
            return $cookies; 
        }         
         
        function stats(){ 
            $stats = array(); 
            if($this->rg) $stats['register_globals'] = 1; 
            else $stats['register_globals'] = 0; 
             
            $stats['PHP-Version'] = phpversion(); 
     
            $this->display("Description", "Value", $stats);     
        } 
         
        function show(){ 
            if($this->old) $session_values = $GLOBALS['HTTP_SESSION_VARS']; 
            else $session_values = $GLOBALS['_SESSION']; 
             
            if(!is_array($session_values)) $session_values = array("No session-vars" => ""); 
             
            $this->display("Name of the variable", "Value", $session_values);     
        } 
         
        function show_errors(){ 
            if(!is_array($this->errors)) $this->errors[] = "No error"; 
             
            $this->display("Description", "", $this->errors, "left"); 
        } 
         
        function clear_errors(){ $this->errors = ""; } 
         
        function display($head_1, $head_2, $content, $align = "center"){ 
                echo    '<table width="300" border="0" cellspacing="0" cellpadding="3" align="center" style="font-family: Arial, Helvetica, Verdana, sans-serif; font-size: 10pt;"> 
                            <tr> 
                                <td bgcolor="#cccccc"><b>' . $head_1 . '</b></td> 
                                <td bgcolor="#cccccc"> </td> 
                                <td bgcolor="#cccccc" align="' . $align . '"><b>' . $head_2 . '</b></td> 
                            </tr>'; 
                             
                foreach($content as $k => $v){ 
                    ($i++ % 2) ? ($c = "#e0e0e0") : ($c = "#eeeeee"); 
                    echo     '<tr> 
                                <td bgcolor="' . $c . '">' . $k . '</td> 
                                <td bgcolor="' . $c . '"> </td> 
                                <td bgcolor="' . $c . '" align="' . $align . '">' . $v . '</td> 
                            </tr>'; 
                } 
                echo    '</table>';             
        }                                     
    } 
?>