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1 <?php |
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2 // $Id: imageserve.inc,v 1.1.2.8.2.2.2.2 2009/07/09 21:21:38 jeremy Exp $ |
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3 |
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4 /** |
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5 * @file |
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6 * Image serving lib. |
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7 * |
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8 * Copyright (c) 2008-2009. |
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9 * Jeremy Andrews <jeremy@tag1consulting.com>. |
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10 */ |
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11 |
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12 /** |
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13 * Generate a tiny image with GD, used to count when an ad has been displayed |
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14 * on a cached page. |
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15 */ |
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16 function adserve_counter_image() { |
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17 adserve_variable('variable_load'); |
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18 adserve_bootstrap(0); |
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19 |
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20 if (adserve_variable('aid')) { |
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21 $aid = adserve_variable('aid'); |
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22 } |
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23 if (isset($aid) && $aid) { |
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24 _debug_echo("adserve_counter_image: increment 'view' counter for aid: $aid"); |
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25 adserve_cache('increment', 'view', $aid); |
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26 } |
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27 else { |
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28 _debug_echo("adserve_counter_image: increment 'count' counter for no aid"); |
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29 adserve_cache('increment', 'count', NULL); |
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30 } |
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31 |
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32 if (function_exists('imagecreate')) { |
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33 $image = imagecreate(1, 1); |
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34 // Tell the web browser not to cache this image so we register a count each |
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35 // time the page is viewed. |
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36 // Expires in the past: |
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37 header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); |
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38 // Last loud: |
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39 header('Last-Modified: '. gmdate('D, d M Y H:i:s') .' GMT'); |
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40 // HTTP 1.1: |
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41 header('Cache-Control: no-store, no-cache, must-revalidate'); |
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42 header('Cache-Control: post-check=0, pre-check=0', FALSE); |
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43 // HTTP 1.0: |
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44 header('Pragma: no-cache'); |
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45 } |
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46 else { |
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47 // GD not installed, report error and exit. |
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48 exit(); |
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49 } |
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50 |
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51 if (function_exists('imagejpeg')) { |
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52 header("Content-type: image/jpeg"); |
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53 imagejpeg($image); |
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54 } |
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55 else if (function_exists('imagepng')) { |
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56 header("Content-type: image/png"); |
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57 imagepng($image); |
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58 } |
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59 else if (function_exists('imagegif')) { |
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60 header("Content-type: image/gif"); |
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61 imagegif($image); |
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62 } |
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63 imagedestroy($image); |
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64 exit(0); |
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65 } |
