first draft

buffer.php

@@ -0,0 +1,47 @@
+<?PHP
+  // Adapted for The Art of Web: www.the-art-of-web.com
+  // Based on PHP code by Dennis Pallett: www.phpit.net
+  // Please acknowledge use of this code by including this header.
+
+  // location and prefix for cache files
+  define('CACHE_PATH', "/tmp/cache_");
+
+  // how long to keep the cache files (seconds)
+  define('CACHE_TIME', 5 * 60);
+
+  // return location and name for cache file
+  function cache_file()
+  {
+    return CACHE_PATH . md5($_SERVER['REQUEST_URI']);
+  }
+
+  // display cached file if present and not expired
+  function cache_display()
+  {
+    $file = cache_file();
+
+    // check that cache file exists and is not too old
+    if(!file_exists($file)) return;
+    if(filemtime($file) < time() - CACHE_TIME) return;
+
+    // if so, display cache file and stop processing
+    readfile($file);
+    exit;
+  }
+
+  // write to cache file
+  function cache_page($content)
+  {
+    if(false !== ($f = @fopen(cache_file(), 'w'))) {
+      fwrite($f, $content);
+      fclose($f);
+    }
+    return $content;
+  }
+
+  // execution stops here if valid cache file found
+  cache_display();
+
+  // enable output buffering and create cache file
+  ob_start('cache_page');
+?>