apache – PHP Caching code stores generated cache file on localhost but not on production server-ThrowExceptions

Exception or error:

I’m using AWS, Ubuntu – LAMP for running my PHP application. I implemented a cache code and was all working fine on localhost, but did not work on server

Below is my folder structure

  - /cache_files
  - index.php
  - contact.php

in .htaccess I’ve set root folder as /app so all the requested are executed from /app folder itself.

Below I’m using the structure

<?php include("cache_header.php"); ?>
      Body Contents
<?php include("cache_footer.php"); ?>

Code for cache_header.php

    $url = $_SERVER["SCRIPT_NAME"];
    $break = Explode('/', $url);
    $file = $break[count($break) - 1];
    $cachefile = 'cache_files/cached-'.substr_replace($file ,"",-4).'.html';
    $cachetime = 18000;

    // Serve from the cache if it is younger than $cachetime
    if (file_exists($cachefile) && time() - $cachetime < filemtime($cachefile))
            // echo "<!-- Cached copy, generated ".date('H:i', filemtime($cachefile))." -->\n";
    ob_start(); // Start the output buffer

Code for cache_footer.php

    // Cache the contents to a cache file
    $cached = fopen($cachefile, 'w');
    fwrite($cached, ob_get_contents());
    ob_end_flush(); // Send the output to the browser

When the above code is executed on localhost it stores the cache file in cache_files/ directory but when i run the same code online it does not save the generated cache file in cache_files/ directory.

If i use below code it generates the cache file and store inside the /app directory where the index file is

$cachefile = 'cached-'.substr_replace($file ,"",-4).'.html';

but if i put cache_files/ it does not work. Why is it so? Where am i going wrong?

When i viewed the apache logs online, it showed me below errors.

fwrite() expects parameter 1 to be resource, boolean given
fclose() expects parameter 1 to be resource, boolean given
open(/cache_files/cached-contact.html): failed to open stream: No such file or directory
How to solve:

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