PHP - Clearing Cache Or Something For All Users

I run an image hosting site and it's using a lot of resources. I temporaly disabled the images by using this code:
<?php
$myImage = imagecreatefromjpeg('ua.jpg');
header("Content-type: image/jpeg");
imagejpeg($myImage);
imagedestroy($myImage);
?>

I redirected all images to one, but he server still getting high loads. Is there a way to cache this image so it doesn't use many resources?

Hi,

I am looking for reliable, effective code to cache one or two of my website webpages. I know there are packages like the pear cache lite but is far beyond my needs and complex in terms of never used pear before etc.

I am looking for a good cache class perhaps or a link to a good cache script. Does anyone have any code they would like to share or know of any good cache classes etc?

I want to keep it relatively simple if possible.

Thanks for any suggestions, help.
PHPLOVER

Does anyone know how to cache Tweets as to not reach the API rate limit? I am using the Twitter-provided widget to display multiple profiles on a website, but the API hits the limit of 150 per hour. Is there any way to cache the Tweets and still use this widget? Or does anyone know of a good widget that caches, or simple code?

If anyone knows, please explain in newbie terms.

Thanks a lot!

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

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?

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 tried to disable caching of HTML for certain pages but they seem to prevent the storing of the php sid cookies. Is there any way to prevent caching and keep cookie?

I did some research on the topic and came across no-cache='set cookie' but the description of that directive seems opposite my need.

Help is a greatly appreciated!

Ive been using no cache at the very top of my page
and then using a header with a number in the link Code: [Select]
<?php header("Location: settings.php?change=3"); ?> so the form updates after submit

Then I have a if statment to echo that form was submited
Any better ideas on how I can do this? 
Shouldnt I beable to just use no cache and use a standard echo in the form with no header in the form
the problem with the way im doing it now if user keeps refreshing the screen it keeps saying the echo. which makes sense
maybe its cause im not using the action in my form correctly with putting a link there?
small example below
Code: [Select]
<?php
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache");
header("Pragma: no-cache");

if(isset($_GET['change'])) {

               echo "form submited";}

if(isset($_POST['build_naq'])) {
if(!empty($_POST['stargate_naq'])) {
                       mysql_query("UPDATE settings SET naq=  '".mysql_real_escape_string($_POST['naq'])."'");
}
header("Location: settings.php?change=3");
}
?>

I have a question about caching files, the way i have seen people do it on tutorials is they save the file to a cache/ folder if non exists,  then check if it exists when the page loads so if it doesn't then load the file normally or if it does then include the cache/file but what is the difference? if the browser has to load the file every time someone goes to it so you cache it for better performance isn't including the cache/file just the exact same thing? the server still has to download the included cached file.

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'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.

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(); 
?>