Pro PHP4 Book code has errors

codesters

Win 2k, IIS5 and php 4.2.1

The code for your wrox press book has lots of errors. I have my error
setting turned to E_ALL. The biggest problem is I cant get the cookies to
work and the header function gives a error message even if its the first
thing first line.

Here is an example of your code from chapter 8 session_test.php

Parse error: parse error, unexpected ',' in C:\web\book\ch08\handler.php
on line 20

Warning: Cannot send session cache limiter - headers already sent (output
started at C:\web\book\ch08\handler.php:20) in C:\web\book\ch08
\session_test.php on line 5

Notice: Undefined variable: count in C:\web\book\ch08\session_test.php on
line 6

Notice: Undefined variable: count in C:\web\book\ch08\session_test.php on
line 8

Notice: Undefined variable: action in C:\web\book\ch08\session_test.php on
line 13

Notice: Undefined variable: action in C:\web\book\ch08\session_test.php on
line 16

Notice: Undefined variable: action in C:\web\book\ch08\session_test.php on
line 23
No action specified
Action:
Notice: Undefined variable: action in C:\web\book\ch08\session_test.php on
line 35

Count: 1

Action: Destroy Force Garbage Collection

Hit refresh to increment the counter

indu_b

Try these snippets of code. It works for me🙂

//handler.php

<?php

$HOST = "localhost";
$DBNAME="sessions";
$USER = "sessionmanager";
$PASS = "sessionmanager";

session_start();

//The name of the MySQL handler/pointer we will be using, and the lifetime of the session as set by php.ini

$HANDLER = "";
$LIFETIME = get_cfg_var("session.gc_maxlifetime");

function sessionOpen($save_path, $session_name)
{
global $HOST, $DBNAME, $USER, $PASS, $HANDLER;

if (!$HANDLER = mysql_pconnect($HOST, $USER, $PASS)) {
    echo("<li>Can't connect to $HOST as $USER");
    echo("<li>MySQL Error: " . mysql_error());
    die;
}

if (! mysql_select_db($DBNAME, $HANDLER)) {
    echo("<li>We were unable to select database $DBNAME");
    die;
}

return true;

}

function sessionClose()
{
return true;
}

function sessionRead($session_key)
{
global $session;

$session_key = addslashes($session_key); 

$session_session_value = 
    mysql_query("SELECT session_value      
                 FROM sessions WHERE session_key = '$session_key'") 
    or die(db_error_message());

if (mysql_numrows($session_session_value) == 1) { 
    return mysql_result($session_session_value, 0); 
} else { 
    return false; 
}

}

function sessionWrite($session_key, $val)
{
global $session;

$session_key = addslashes($session_key); 
$val = addslashes($val); 
$session = mysql_result(mysql_query("SELECT COUNT(*) FROM sessions 
WHERE session_key = '$session_key'"), 0); 

if ($session == 0) { 
    $return = 
        mysql_query("INSERT INTO sessions
                     (session_key, session_expire, session_value) 
                     VALUES ('$session_key', 
                     UNIX_TIMESTAMP(NOW()), '$val')") 
        or die(db_error_message()); 
} else { 
    $return = mysql_query("UPDATE sessions 
                           SET session_value = '$val', 
                               session_expire = UNIX_TIMESTAMP(NOW()) 
                           WHERE session_key = '$session_key'")
        or die(db_error_message()); 

    if (mysql_affected_rows() < 0) { 
        echo("We were unable to update session 
              session_value for session $session_key"); 
    } 
} 
return $return;

}

function sessionDestroyer($session_key)
{
global $session;

$session_key = addslashes($session_key);

$return = mysql_query("DELETE FROM sessions 
                       WHERE session_key = '$session_key'") 
    or die(db_error_message()); 
return $return;

}

function sessionGc ($maxlifetime)
{
global $session;
$expirationTime = time() - $maxlifetime;

$return = mysql_query("DELETE FROM sessions WHERE session_expire <
$expirationTime") or die(db_error_message()); 
return $return;

}

session_set_save_handler(
'sessionOpen',
'sessionClose',
'sessionRead',
'sessionWrite',
'sessionDestroyer',
'sessionGc'
);
?>

and try this for session_test.php

//session_test.php

<?
include("handler.php");

session_start();
session_register("count");

$count++;

// Increment our count variable in which we store
// the accesses to the page

if ($action == "destroy") {
session_destroy();

} elseif ($action == "gc") {

// We actually force garbage collection here by
// directly calling our custom handler that does so.

$maxlife = get_cfg_var("session.gc_maxlifetime");
sessionGc($maxlife);

} elseif (!$action) {
echo("No action specified ");
} else {
echo("Cannot do $action with the session handlers ");
}
?>

<head>
<title>Session Test Functions</title>
</head>
<body>Action: <?=$action?> 
Count: <?=$count?>

<form action="<?=$PHP_SELF?>" method="POST">
<table border=0>
  <tr>
    <td>Action:</td>
    <td>
      <select name="action">
      <option value="destroy">Destroy</option>
      <option value="gc">Force Garbage Collection</option>
      </select>
    </td>
  </tr>
  <tr>
  <td></td>
  <td><br><input type="submit"></td>
  </tr>
</table>
<center>Hit refresh to increment the counter</center>
</form>

</body>

Make sure that your MySQL database that stores your sessions and session information is up and running.

Let me know if you got it.

Cheers,
InduB

codesters

Thanks for the response but what I really need is to get the cookies working as I want to build a members script which users cookies.

codesters

fixed it thanks.