Script gets executed twice unless filename is in the URL

[oju]

Sometimes my scripts calls the server twice even if is a simple stright-forward one.

I usually runs a trace in the background when I'm testing new scripts. And quite often I can see, that the server has been called two times.

Not very smart if you're maintaining a counter across calls.



First it was all voodoo, but I think I have found a pattern:

If I write http://domain.com or plain www.domain.com then the script allways runs twice

But if I add the name of the script as in http://domain.com/index.php the number of runs may be one or two.

Can somone explain what's going on?

[pbmods]

Changed thread title to better match contents.

Can somone explain what's going on?

Not likely, unless we had some relevant code snippets to work with.

[oju]

Pew... that's a lot of code... But here it goes

 <?php 
class c_tabsession {
/* Change the values of following conatants if you like */
const QRYNAME = "tbsi"; // "Tabbed browser session info"
const TMPPATH = "/tmp/"; // Location to workfile 
const GCPERIOD = 3600; // Number of seconds until a untouched workfile will be deleted
/* 
You will possible need some more constants 
for your i encrypt/decrypt algorithm 
*/
private $translink; // This is the encrypted filename and some other important data
 
private $important1; // integer
private $important2; // 32 bit hex
private $fileId; // reference top /tmp/workfile
 
public $qryin = array(); // Holds data passed by $_GET and $_POST
public $session = array(); // Holds session data
 
public function __construct()
{
if ( self::transInfo( $this->translink ) )
    self::transDecrypt( $this->translink );
else
    { /* Make an new identifyer and lock it by redirect to self */
     $this->translink = self::transEncrypt( $this->userId, $this->mdPass, $this->fileId );
     header( "location: " . self::href($_ENV['SCRIPT_URI'], http_build_query( $this->qryin )));
     exit; 
    }
/* Invariant: All variables are initiated */
self::getSession(); 
}
 
public function __destruct()
{ /* Very important! Ensures that session-data are preserved */
self::GarbageCollect();
self::putSession();
}
 
public function href( $uri, $QueryString = "" )
{ /* Creates URL. You are advised to use 'http_build_query()' to create the $QueryString */
     $uri .= "?" . http_build_query( array( self::QRYNAME => $this->translink) );
if ( ! empty( $QueryString ) ) $uri .= "&" . $QueryString;
return $uri;
} 
 
public function hidden( )
{ /* creates a hidden field to be used in forms */
return '<input name="'
        . self::QRYNAME
     . '" type="hidden" value="'
     . $this->translink
     . '">'. "\n";
}
 
public function dumpSess( $a_sess, $key = "SESSION_ROOT", $indent = "" )
{ /* Recursive dump of SESSION structure */
if (is_array($a_sess) )
{
    echo "-ARRAY-<br>\n";
    foreach($a_sess AS $key => $value) self::dumpSess( $value, $key, $indent . str_repeat("&nbsp;",3) );
    return; // void
}
if (is_bool($a_sess)) echo (($a_sess)?"TRUE":"FALSE"), " #BOOLEAN#<br>\n";
else echo $a_sess, " #", strtoupper( gettype( $a_sess )), "#<br>\n";
return; // void
} 
private function transInfo(&$link)
{
$link = "";
/* Emulate $_REQUEST without $_COOKIE */
$this->qryin = array_merge($_GET, $_POST);
if ( ! isset( $this->qryin[self::QRYNAME] ) )
{
/* First time - Generate the basic "session-id" */
    $this->important1 = self::SOME_DEFAULT;
    $this->important2 = md5( self::ANOTHER_DEFAULT );
    $this->fileId = md5( uniqid( rand(), true ));
    return false;
}
$link = $this->qryin[self::QRYNAME];
unset( $this->qryin[self::QRYNAME] );
return true;
}
 
private function transEncrypt( $important1, $important2, $fileId )
{ // CHANGE function transDecrypt simultanious with this
/* 
    Make some encryption algorithm to mess up the parameters
    (I'd rather not disclose my own)
*/
     return $link;
}
 
private function transDecrypt( $link )
{ // DEPENTING on function transEncrypt
/* Bring string back in correct order
    store result in object variables 
    */
return; // void
}
 
private function getSession()
{ // Read session-file into object-storage
$path = self::SessionPath();
if (file_exists( $path ) ) 
{
    $file = file_get_contents($path);
    $this->session = unserialize($file);
    return; // void
}
$this->session = array();
return; //void
}
 
private function putSession()
{ // Save session-data on file. Invariant: $this->session in an array
$path = self::SessionPath();
$file = serialize( $this->session );
file_put_contents( $path, $file );
return; // void 
}
private function SessionPath()
{
$path = $_ENV['DOCUMENT_ROOT'] . self::TMPPATH;
$file = base_convert( $this->fileId, 16, 35 ); // Compress filename
             // don't worry it's still unique
$path .= strtoupper(self::QRYNAME) . "_" . $file . ".txt";
return $path;
}
 
private function GarbageCollect()
{ // Removes sessionfiles older than GCPERIOD seconds
$path = $_ENV['DOCUMENT_ROOT'] . self::TMPPATH;
$path .= strtoupper(self::QRYNAME) . "_*.txt";
$files = glob($path);
foreach($files as $file){
    if(is_file($file)) 
    {
     if ((filectime($file) + self::GCPERIOD) < time()) unlink($file);
    }
}
return; // void
}
} // End of class c_tabsession
?>
<?php 
/*
This class includes all elements that must be available to every page 
*/
class c_masterpage extends c_tabsession {
 
 
public function __construct()
{
$develop = new c_construction( true ); // This line will set all subdomains to test-mode
             // move it to separate subdomains, when production starts
parent::__construct(); self::test_input(); 
}
 
public function __destruct() { self::test_output(); parent::__destruct(); } // IMPORTANT !!!
 
/***************************************************************************************** 
*                             Test functions                                         * 
*****************************************************************************************/
 
private function test_input()
{
// return;
$log = new c_syslog( $_ENV['DOCUMENT_ROOT'] . "/_ress/log/trace.txt", "Input" );
$log->log( print_r( $_GET, true ), "GET" );
$log->log( print_r( $_POST, true ), "POST" );
$log->log( print_r( $_COOKIE, true ), "COOKIE" );
$log->log( print_r( $this->session, true ), "SESSION" );
$log->log( print_r( $_ENV, true ), "ENV" );
}
 
private function test_output()
{
// return;
$log = new c_syslog( $_ENV['DOCUMENT_ROOT'] . "/_ress/log/trace.txt", "Output" );
$log->log( print_r( $this->session, true ), "SESSION" );
}
 
private function test_trace( $arg )
{
static $counter = 0; $counter++;
$log = new c_syslog( $_ENV['DOCUMENT_ROOT'] . "/_ress/log/trace.txt", "Trace" );
$log->log( $arg , $counter );
}
 
} // End of class c_masterpage
?>
<?php
$page = new masterpage();
$page->session['counter']++;
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Dummy</title>
</head>
<body>
</body>
</html>
 

[oju]

Cannot send my trace - gets wierd error-message :(

[oju]

Cannot send my trace - gets wierd error-message :(

You can read it on www.junne.dk/drill/double.txt

[oju]

I've found the perpetrator, but not the reason.

The last part of my HTML-code goes like this:
[HTML] <div id="siteInfo"> <img src="" width="44" height="22"> <a href="#">Om dette web-sted </a> | <a href="#">Tekniske Krav </a> | <a href="#">Din Sikkerhed </a> | <a href="#">Webmaster</a> | &copy;2007 Antvorskov Kirke </div>
[/HTML]
And it is id="siteInfo", that does the damage. When I remove this, the loop stops. "siteInfo" has a reference to my css stylesheet, saying:

 #siteInfo{
clear: both;
border-top: 1px solid #cccccc;
font-size: small;
color: #cccccc;
padding: 10px 10px 10px 10px;
margin-top: 0px;
}
 

But it looks quite stright-forward. So I'm clueless :((

Anyway - now I have removed the reference so I can get on with my work.

[oju]

It came back - this annoying double server-call. And this time I could count out errors in CSS. But then I noticed something. I'm working with a template of the fill-in-the-blanks kind, and I had'nt filled in the images yet, so I had a line like this:

[HTML] <img src="" alt="" width="119" height="180"> [/HTML]

- and BINGO! I got two calls to the server. Now examine the css-code I posted last time: It had an empty image-source too.

I still don't know why, but just take care out there :-)

[pbmods]

Heya, Oju.

Glad to hear you got it working! Good luck with your project, and if you ever need anything, post back anytime :)