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一个php的页面缓存类

程序员文章站 2022-03-23 17:26:15
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  1. /* $cache = new Cache("../cache/",20); // 构造函数,创建缓存类对象

  2. $cache->PutCache(); // 倒出缓存
  3. */
  4. class Cache
  5. {
  6. private $CacheDir = ’Cache’; /* 缓存目录 */
  7. private $SetTimeOut = 10; /* 缓存过期时间 */
  8. private $SetExt = ’.cache’; /* 缓存文件后缀名 */
  9. private $CacheFileUrl = ’’; /* 缓存文件所在地址 */
  10. private $CacheConfigFile = ’’; /* 缓存文件配置信息 */
  11. public $LastUnixTimePoke = 0; /* 上一次缓存的 Unix 时间戳 */

  12. public $CurrentUnixTimePoke = 0;/* 当前缓存的 Unix 时间戳 */
  13. public $NextUnixTimePoke = 0; /* 下一次缓存的 Unix 时间戳 */
  14. public $UnixNowToNext = 0; /* 现在和下一次缓存相差的 Unix 时间戳 */
  15. public $LastTimePoke = 0; /* 上一次缓存的时间 */

  16. public $CurrentTimePoke = 0;/* 当前缓存的时间 */
  17. public $NextTimePoke = 0; /* 下一次缓存的时间 */
  18. public $DataLength = 0; /* 缓存区内容长度 */

  19. public $CacheToPage = ’’; /* 缓存文件内容 */
  20. private $SplitTeam = false; /* 是否分组存放Cache文件 */
  21. public $Cache = false; /* 是否需要缓存,用户外界判断 */

  22. private $_IsCache = false; /* 是否能够缓存 */

  23. public function Cache($SetTimeOut = 20,$CacheDir = ’Cache’,$SplitTeam = false,$SetExt = ’.cache’)

  24. {
  25. $this->CacheDir = $CacheDir;
  26. $this->SplitTeam = $SplitTeam;
  27. if(!is_numeric($SetTimeOut))
  28. {
  29. $this->ErrResponse(’缓存过期时间设置无效’);
  30. return false;
  31. } else {
  32. $this->SetTimeOut = $SetTimeOut;
  33. }
  34. $this->SetExt = $SetExt;
  35. /* 缓存开始 */

  36. ob_clean();
  37. ob_start();
  38. ob_implicit_flush(0);
  39. $this->CreateCache();
  40. return true;
  41. }
  42. private function CreateCache()

  43. {
  44. $_CacheFile = str_replace(’.’,’_’,basename($_SERVER[’PHP_SELF’])) . ’_’ .
  45. md5(basename($_SERVER[’PHP_SELF’])) . $this->SetExt;
  46. $_CacheConfig = str_replace(’.’,’_’,basename($_SERVER[’PHP_SELF’])) . ’_’ . ’.cof’;
  47. if(!file_exists($this->CacheDir))

  48. {
  49. mkdir($this->CacheDir,0777);
  50. }
  51. if($this->SplitTeam)

  52. {
  53. $_CacheConfigDir = $this->CacheDir . str_replace(’.’,’_’,basename($_SERVER[’PHP_SELF’])) . ’_/’;
  54. if(!file_exists($_CacheConfigDir))
  55. {
  56. mkdir($_CacheConfigDir,0777);
  57. }
  58. $_CacheUrl = $this->CacheDir . $_CacheConfigDir . $_CacheFile;
  59. $_CacheConfigUrl = $this->CacheDir . $_CacheConfigDir . $_CacheConfig;
  60. } else {
  61. $_CacheUrl = $this->CacheDir . $_CacheFile;
  62. $_CacheConfigUrl = $this->CacheDir . $_CacheConfig;
  63. }
  64. if(!file_exists($_CacheUrl))

  65. {
  66. $hanld = @fopen($_CacheUrl,"w");
  67. @fclose($hanld);
  68. }
  69. if(!file_exists($_CacheConfigUrl))

  70. {
  71. $hanld = @fopen($_CacheConfigUrl,"w");
  72. @fclose($hanld);
  73. }
  74. $this->CacheConfigFile = $_CacheConfigUrl;

  75. $this->CacheFileUrl = $_CacheUrl;
  76. $this->CheckCache();
  77. return true;
  78. }
  79. private function CheckCache()

  80. {
  81. $_FileEditTime = @filemtime($this->CacheFileUrl);
  82. $_TimeOut = $this->SetTimeOut;
  83. $_IsTimeOut = $_FileEditTime $_TimeOut;
  84. $this->LastUnixTimePoke = $_FileEditTime;

  85. $this->NextUnixTimePoke = $_IsTimeOut;
  86. $this->CurrentUnixTimePoke = time();
  87. $this->UnixNowToNext = $this->NextUnixTimePoke - time();
  88. $this->LastTimePoke = date("Y-m-d H:i:s",$_FileEditTime);

  89. $this->NextTimePoke = date("Y-m-d H:i:s",$_IsTimeOut);
  90. $this->CurrentTimePoke = date("Y-m-d H:i:s",time());
  91. $_TxtInformation = "上次缓存时间戳: $this->LastUnixTimePoke ";

  92. $_TxtInformation .= "当前缓存时间戳: $this->CurrentUnixTimePoke ";
  93. $_TxtInformation .= "下次缓存时间戳: $this->NextUnixTimePoke ";
  94. $_TxtInformation .= "上次缓存时间: $this->LastTimePoke ";

  95. $_TxtInformation .= "当前缓存时间: $this->CurrentTimePoke ";
  96. $_TxtInformation .= "下次缓存时间: $this->NextTimePoke ";
  97. $_TxtInformation .= "距离下次缓存戳: $this->UnixNowToNext ";

  98. $handl = @fopen($this->CacheConfigFile,’w’);

  99. if($handl)
  100. {
  101. @fwrite($handl,$_TxtInformation);
  102. @fclose($handl);
  103. }
  104. if($_IsTimeOut >= time())

  105. {
  106. $this->GetCacheData();
  107. }
  108. }
  109. private function ClearCacheFile()

  110. {
  111. @unlink($this->CacheFileUrl);
  112. @unlink($this->CacheConfigFile);
  113. }
  114. public function PutCache()

  115. {
  116. $this->DataLength = ob_get_length();
  117. $PutData = ob_get_contents();
  118. if(!file_exists($this->CacheFileUrl))
  119. {
  120. $CreateOK = $this->CreateCache();
  121. if(!$CreateOK)
  122. {
  123. $this->ErrResponse(’检查缓存文件时产生错误,缓存文件创建失败’);
  124. return false;
  125. }
  126. } else {
  127. $hanld = @fopen($this->CacheFileUrl,"w");
  128. if($hanld)
  129. {
  130. if(@is_writable($this->CacheFileUrl))

  131. {
  132. @flock($hanld, LOCK_EX);
  133. $_PutData = @fwrite($hanld,$PutData);
  134. @flock($hanld, LOCK_UN);
  135. if(!$_PutData)
  136. {
  137. $this->ErrResponse(’无法更改当前缓存文件内容’);
  138. return false;
  139. } else {
  140. @fclose($hanld);
  141. return true;
  142. }
  143. } else {
  144. $this->ErrResponse(’缓存文件不可写’);
  145. return false;
  146. }
  147. } else {
  148. $this->ErrResponse(’打开缓存文件发生致命错误’);

  149. return false;
  150. }
  151. }
  152. }
  153. public function GetCacheData()

  154. {
  155. $hanld = @fopen($this->CacheFileUrl,"r");
  156. if($hanld)
  157. {
  158. if(@is_readable($this->CacheFileUrl))
  159. {
  160. $this->CacheToPage = @file_get_contents($this->CacheFileUrl);
  161. $IsEmpty = count(file($this->CacheFileUrl)); //判断缓存文件是否为空
  162. if($IsEmpty > 0)

  163. {
  164. echo $this->CacheToPage;
  165. @fclose($hanld);
  166. ob_end_flush();
  167. exit();
  168. }
  169. } else {
  170. $this->ErrResponse(’读取缓存文件内容失败’);
  171. return false;
  172. }
  173. } else {
  174. $this->ErrResponse(’打开缓存文件失败’);
  175. return false;
  176. }
  177. }
  178. private function ErrResponse($Msg)

  179. {
  180. echo $Msg;
  181. }
  182. }
  183. ?>
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