Mercurial > SimpleWebPresenter

annotate CacheTimeCheck.inc @ 39:bd82b719a0de

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Make CacheTimeCheck a singleton. Robustify if_modified_since check. Quiet warnings. Set debug levels. Fix basepath references.
author Tom Fredrik "BFG" Klaussen <bfg@blenning.no>
date Fri, 05 Oct 2012 00:21:27 +0200
parents 42533600214b
children fbbb82ced6de
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1 <?php
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2 class CacheTimeCheck
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3 {
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4 private $newest;
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5 private $files = array();
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6 private static $myInstance = 0;
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7
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8 private function __construct($filename = False)
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9 {
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10 if ($filename)
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11 $this->cache_time($filename);
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12 $this->cache_time(__FILE__);
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13 }
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15 function instance($filename = False)
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16 {
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17 if (! self::$myInstance)
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18 self::$myInstance = new self($filename);
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19 elseif ($filename)
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20 self::$myInstance->cache_time($filename);
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21 return self::$myInstance;
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22 }
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23
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24 function CheckHttpModified()
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25 {
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26 if (DEBUG_LEVEL >= VERBOSITY_DEBUG)
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27 var_dump($_SERVER);
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29 $gmdate_mod = gmdate('D, d M Y H:i:s', $this->newest) . ' GMT';
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30
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31 if(array_key_exists('HTTP_IF_MODIFIED_SINCE', $_SERVER)) {
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32 $HTTP_IF_MODIFIED_SINCE = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
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33 $if_modified_since = preg_replace('/;.*$/', '', $HTTP_IF_MODIFIED_SINCE);
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34
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35 if (strtotime($if_modified_since) >= $this->newest) {
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36 header("HTTP/1.0 304 Not Modified");
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37 exit;
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38 }
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39 }
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41 header("Last-Modified: $gmdate_mod");
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42 }
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43
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44 function cache_time($path)
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45 {
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46 if (!file_exists($path)) {
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47 if (DEBUG)
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48 print "${path} does not exist";
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49 errorPage("Resource not available");
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50 }
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52 array_push($this->files, $path);
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53 $mtime = filemtime($path);
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54 if ($mtime > $this->newest) {
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55 $this->newest = $mtime;
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56 }
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57 }
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58
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59 function includeOnce($path)
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60 {
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61 $this->cache_time($path);
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62 include_once($path);
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63 }
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65 function loadFile($path)
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66 {
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67 $this->cache_time($path);
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68 return loadFile($path);
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69 }
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70 }
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71 ?>