PHP - No-cache W/ Keep Cookies

I need to know when a file was last modified to see if the browser has an updated cached version, if the browser does use its cache otherwise get the most current version.

How can I do this?

Hi,

I have a question. is that code below made a problem in google search, mean if I put this codes in header did google find my homepage?

header( 'Cache-Control: no-store, no-cache, must-revalidate' );
header( 'Cache-Control: post-check=0, pre-check=0', false );
header( 'Pragma: no-cache' );
header( 'Expires: Mon, 26 Jul 1997 05:00:00 GMT' );
header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT' );

Thnx.

T

Hi Guys   I have recently been looking into implementing browser caching after reading this: https://developers.g...ctices/caching    There are a few things in that google article that don't make much sense to me so I'm hoping someone can clarify.   Firstly Question   The document says:   " we recommend that you configure your web server to explicitly set caching headers and apply them to all cacheable static resources"   This implies you can set caching headers for just some resources. How would you do this? Lets assume I only wanted to set caching headers for a file styles.css - would I need to output headers within the CSS file and then change the extension to .php? e.g.

<link rel="stylesheet" href="styles.php"/>

Second question   Etags have me very confused. How would you set etag headers for specific files and then generally? And if you set the etag in the header of the main php page does that mean everything gets cached?     Any help someone can provide would be very, very welcome!   Drongo

I want to set the correct header / cache values for a site.

I am working on a social network / forum style site.

I want to ensure that every page a user requests results in a fresh one being requested from the server as most content changes by the minute.

(1) How would I set this?

(2) Also, can I prevent nav bars being reloaded as these never, ever change.

I have some JavaScript that sends an AJAX request to the following PHP script every 4 seconds.  The idea behind this is that every 4 seconds a new, randomly generate piece of content is loaded.  This works fine in Firefox and Chrome, however when I test it in IE it seems to just load the same piece of content over and over again.  I'm pretty sure there is nothing wrong with the script so could this be something to do with IE caching the first piece of content returned?  Thanks for any help. 


$random_number = 0;
$random_number = rand(1,6);

if ($random_number == 1 ) {

echo("<a href=\"\"><h4>Aliquam erat volutpat. Vivamus feugiat tempor quam, faucibus elementum.</h4><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque vitae ante at erat tempor facilisis. Quisque blandit faucibus suscipit. Proin suscipit est sed. </p></a>");

} 

if ($random_number == 2) {

echo("<a href=\"\"><h4>Quisque ac lacus nibh, ac semper ante. Sed imperdiet.</h4><p>Vestibulum aliquam pellentesque lacus quis mollis. Proin quis lobortis libero. Ut nec tempor lectus. Pellentesque habitant morbi tristique senectus et netus id. </p></a>");

}

if ($random_number == 3) {

echo("<a href=\"\"><h4>Suspendisse vestibulum dui augue, nec viverra erat. Proin id.</h4><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi eu sollicitudin elit. Cras mauris mi, luctus non luctus quis, tristique vitae turpis turpis duis. </p></a>");

}

if ($random_number == "4") {

echo("<a href=\"\"><h4>Vestibulum gravida elit posuere arcu.</h4><p>Phasellus sit amet rutrum purus. Cras vulputate pretium quam eleifend viverra. Morbi convallis eros ac tellus suscipit nec euismod nibh semper. In quam posuere. </p></a>");

}

if ($random_number == "5") {

echo("<a href=\"\"><h4>Vestibulum ante ipsum primis in.</h4><p>Aliquam consectetur aliquet libero. Mauris malesuada tortor eu ipsum mollis sit amet blandit erat sollicitudin. Cras consequat dui ac elit semper pharetra amet. </p></a>");

}

if ($random_number == "6") {

echo("<a href=\"\"><h4>Nam ornare, nisl non interdum aliquam, erat urna consequat elit, vel.</h4><p>Nulla ut libero est, eu convallis urna. Nullam fringilla mollis ligula, id fringilla enim sagittis non. Nunc lectus nunc, condimentum eget imperdiet massa nunc.</p></a>");

}

I've added a js scroller to a client's website, and they are able to edit the scroller text using a php text editor. The script is in a .txt file that is added to the homepage with a php include. Problem is, the edits don't show up right away, sometimes not until next day. I've had the same problem with Flash players (playlists are .txt files), and occassionally with image files, in both IE and FF. Browser continues to use the old file, even if cache is cleared, unless file is renamed. I've cleared cache, confirmed that the old file is gone, deleted the file entirely from the server, rebooted - pretty much everything. Tried onLoad="refresh()", no effect.

Anyone know what causes this, and how to fix it?

I could really use some advise and ideas on PHP caching. Specifically I'm working on a CMS application and after its completed I realized there is an opportunity to increase performance if some of the pages are cached. And the terms I'm using for search are taking too long to sift through 

I thonk what I'm looking for could be like a CGI script, but I don't have any experience with that right now. Another idea is to wrap my 'public php' page with a check for an existing cached file, else run the query. And add, somewhere in my existing 'admin php' page, a write to file scriptie to create the cache file.

Or something else entirely. I don't know yet. I'd like to read some explanations of projects and scripts that either create a 'push CMS' application, or maybe a 'pull CMS' where the parameters for the cache are not time-based (expiration) but file based (file exist?). Or something else...

Kudos and huzz-zaa's for the dude who can put words to my dribble.

How can I delete cache files when any update take place.
I don't need to delete files after certain period of time pass.

I have built a small database which use the Twitter API to extract data from the listed members XML files (http://twitter.com/users/show.xml?screen_name=username) and it works well, but since the database makes several calls everytime a page loads I get kicked out very quickly, even with a small memberbase. So I wonder what solution would help with this problem?

I have considered dropping the XML data into the database and saving each XML file on the server, but I am not sure what solution would be best?

I downloaded a script for a poll/voting kinda thing for all my site visitors a while ago and then I tweaked it a bit. It is linked to a database. It grabs the question and possible answers from one database. It also stores user votes, ip addresses, and the date they voted in a database.    I went to change the question and possible answers in my poll by simply changing the options in the Database. This worked fine, but I found a big problem! If you have already voted in the poll, then it displays the results to you every time you visit the site . I assumed this was based off your IP since it is recorded in the database. So logically I thought if you cleared all the IP's in the DB, then the new question would display for every user, but to my alarm it is based off cookies. This is problem because even though I changed the question and options, if people have not cleared their cookies from the last time then the poll still displays the results even though they have not voted on the new question yet. Is there someway to clear everyone cookies or make the poll start fresh for everyone without drastically changing the code and how the entire thing works?
Edited by ryanmetzler3, 24 May 2014 - 09:33 PM.

Code: [Select]
<?php
$img = $_GET['img'];
$wid = $_GET['wid'];
$hei = $_GET['hei'];
$xoff = $_GET['xoff'];
$yoff = $_GET['yoff'];

if($img == 0)
return;

$image = array("HyruleTown","Bosses","ForestNPCs","RoyalFamily","Rings");


header("Content-type: image/png");
$im = imagecreatefrompng($image[$img - 1] . ".png");
$dest = imagecreatetruecolor($wid, $hei);
imagecopy($dest, $im, 0, 0, $xoff, $yoff, $wid, $hei);

imagepng($dest);
imagedestroy($dest);
imagedestroy($im);
?>
This script allows you to take an image and only show parts of it. This script works great, but there's one problem. As I add more and more to a page, it takes longer and longer to load.

http://openzelda.thegaminguniverse.com/wiki/index.php5?title=OZWiki:Alien_Invasion

There will be a lot more php images added soon. I used this method so I don't have to upload a ton of images at once.
So is there a way to speed things up? Is it possible to have it save cache so the images don't reload everytime you refresh the page?

What's the best way to cache things on the server? I've found some SetEnv things but this all seems to be a single key/value.   I'd like to cache an array of things that I can access later. Right now it's cached in $_SESSION which is fine, but still there's overhead on every first-time visitor to a site. Is there a way to add something to $_SERVER or elsewhere that ALL visitors to a website will ultimately be able to access?   I guess I want something like web.config in C#, where the first time a page is visited, the "app starts", as it were, and those things are now in cache on the server.   What's the best way to do this?

I am getting a rediculous amount of errors in the log on my host saying the following but for numerous referer addresses.
Code: [Select]
[Wed Sep 21 12:15:32 2011] [error] [client 85.189.254.101] PHP Warning:  fwrite(): supplied argument is not a valid stream resource in /home/sites/myurl.co.uk/public_html/Category.php on line 122, referer: http://www.myurl.co.uk/Category/En/Floats/
it is a simple cache system i use and it appears to work as when you view source at the bottom of the page is the comment about the file being cached and retrieved. My page code:

Code: [Select]
<?php 
   $cat = $_GET["cat"];
   $sub_cat = $_GET["sub"];
   $language = $_GET["lang"];
$cachefile = "cache/".$cat."-".$sub_cat."-".$language.".html";


      $cachetime = 60 * 60 * 400; // 5 days


      // Serve from the cache if it is younger than $cachetime

      if (file_exists($cachefile) && (time() - $cachetime
         < filemtime($cachefile))) 
      {

         include($cachefile);


         echo "<!-- Cached ".date('jS F Y H:i', filemtime($cachefile))." -->";


         exit;

      }

      ob_start(); // start the output buffer
 include("./includes/db_con.inc.php");
$page_title = $cat . " - " . $sub_cat;
$sql_meta = mysql_query("SELECT * FROM sub_cat WHERE name='$sub_cat'");
$row_meta = mysql_fetch_assoc($sql_meta);
$meta_desc = $row_meta['META_DESC'];
$meta_key = $row_meta['META_KEY'];
 include("./includes/head.php"); 
 include("./includes/header.php");
 mysql_free_result($sql_meta);
  ?>

<div id="main-page-header">
<?php 
$desc_sql = mysql_query("SELECT * FROM sub_cat WHERE name='$sub_cat'");
$row_desc = mysql_fetch_assoc($desc_sql);
$description = $row_desc['description'];
echo "<img src='$img_loc/product-pages/sub-cat-head/".str_replace(" ", "-", $row_desc['name'])."-sub-cat-head.jpg' width='940' height='310' />";
mysql_free_result($desc_sql);
?>
</div>

  <div id="page-content">
 
    <div id="main-page-text">
   
    <h1><?php echo $sub_cat; ?></h1>
<h2 class="crumbs"><a href="<?php echo "$url/Products/$lang/"; ?>">Products</a> > <a href="<?php echo "$url/Category/$lang/".urlencode($cat)."/"; ?>"><?php echo $cat; ?></a> > <?php echo $sub_cat; ?></h2>
<p>
<?php echo $description; ?>
</p>

  <script src="http://connect.facebook.net/en_US/all.js#xfbml=1"></script><fb:like layout="button_count" show_faces="false" width="170" font="verdana"></fb:like>

   
  <div id="related-wrap">
 
  <h2><?php echo $sub_cat; ?> Products</h2>
   
    <?php
$range_products = mysql_query("SELECT * FROM $table WHERE CATEGORY='$cat' AND SUB_CATEGORY='$sub_cat' AND display='1' ORDER BY sortID ASC");
while($row_range = mysql_fetch_array($range_products))
    { 
$prodid = str_replace("/", "-", $row_range['PRODID']);
$cat_link = urlencode($row_range['CATEGORY']);
$sub_cat_link = urlencode($row_range['SUB_CATEGORY']);
echo "<div class='related-products'>\n<a class='related-img' href='$url/Product/$lang/$cat_link/$sub_cat_link/$prodid/'>\n<img src='$img_loc/product-pages/Range-thmb/$prodid.jpg' width='120' height='120' /></a>\n";
    echo "<h5>" . $row_range['PROD_TITLE'] . "</h5>\n";
    echo "</div>\n";
}
mysql_free_result($range_products);
?>

    </div>   
   
     <div id="FAQ-wrap"><h2>Frequently Asked Questions</h2>
  <?php
  $QA_table = $lang . "_qanda";
  if ($id=="") {
      $list_QA = mysql_query("SELECT * FROM $QA_table WHERE SUB_CATEGORY='$sub_cat' AND DISPLAY='1'") or die();
  }
  else {
  $list_QA = mysql_query("SELECT * FROM $QA_table WHERE PRODID='$id' AND DISPLAY='1'") or die();
}
  while($row_QA = mysql_fetch_array($list_QA))
{ 
  echo "<div id='FAQ-QA'>";
  echo "<h2 class='FAQ-question'>Q: ".$row_QA['QUESTION']."</h2>";
     echo "<p class='FAQ-question'>A: ".$row_QA['ANSWER']."</p></div>";
}
mysql_free_result($list_QA);
  ?>
    <div id="FAQ-question">
        <h2 class="white">Got a question about the
       
        <span class="got-question-product"><?php echo $sub_cat; ?></span>
       
        </h2> 
      </div>
     
      </div>

   

    </div>


   
    <div id="totem-menu-container"><?php include("./includes/search.php") ?>
   
    <?php include("./includes/totem.php") ?>
   
    </div>
 
  </div>
  </div>
<!-- MAIN CONTENT OF PAGE BELOW HERE -->

<!-- END MAIN CONTENT OF PAGE BELOW HERE -->

 
 
 
<?php include("./footer.php") ?>

<?php
       // open the cache file for writing
       $fp = fopen($cachefile, 'w'); 


       // save the contents of output buffer to the file
    fwrite($fp, ob_get_contents());

// close the file

        fclose($fp); 

// Send the output to the browser
        ob_end_flush(); 
?>
   
   
   

I am using php require to input a page of code.  I am including (require) that file several times within the page.  I am guessing that it executes the file every time, and does not save any page loading time, and in fact probably slowing it down because it has to make the request every time.   Just wanted an expert to confirm or deny my educated guess.  Would it be the same if it were including an html file instead of a php file?

<?php require ("$base_path/main_page_rotation/content4.php"); ?>

Hi Guys,

I am building this website for experimental data collection. I am getting the below error at the bottom of the website but don't know how it has creep-ed in. Kindly help me out in this issue.

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/computat/public_html/b2.php:199) in /home/computat/public_html/_config-rating.php on line 21. Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE id='b2'' at line 1

My _config-rating.php file is:

Code: [Select]
<html>
<head>
<title>

Do you Like/Dislike this image?

</title>
</head>
<body>
<h1>
Do you Like/Dislike this image?
</h1>
<form name="form1" method ="post">
<input type="submit" name="Like"    value="Like">
<input type="submit" name="Dislike" value="dislike">
</form>
</body>
</html>
<?php
session_start();
ob_start();
$host="localhost";
$username="computat_abhi";
$password="1123581321";
$databasename="computat_button";
$tbl_name="record";

$db=mysql_connect ("localhost", "computat_abhi", "1123581321")or die(mysql_error());
mysql_select_db($databasename, $db) or die(mysql_error());

if( isset($_POST['Like']) )
{



$sql = 'INSERT INTO record(ImageNumber,LikeCounter) VALUES (\'b1\', 1)';


mysql_query($sql, $db) or die(mysql_error());



echo 'Like vote was registered';
}
elseif(isset($_POST['Dislike'])){



$sql = 'INSERT INTO record(ImageNumber,DislikeCounter) VALUES (\'b1\', 1)';


mysql_query($sql, $db) or die(mysql_error());



echo 'Dislike vote was registered';
}

Please help me out as soon as possible. Thanks :)


ob_end_flush();
?>

Please help me out