ecshop页面缓存详解
ecshop缓存详解
小结：主要根据$cache_id,caching参数判断是否需要缓存，若缓存文件存在且未过期则直接从缓存文件中读取缓存，若缓存文件过期则重新编译，判断编译文件是否过期，若未过期则直接生成缓存，若过期了则重新编译。
is_cached方法解析
display页面呈现方法
catch页面编译方法
代码块
判断缓存是否存在：
#判断是否存在该页面的缓存if (!$smarty->is_cached('index.dwt', $cache_id)){ #do something ...}$smarty->display('index.dwt', $cache_id);---------------------------------------------------------#判断缓存函数function is_cached($filename, $cache_id = '') { $cachename = basename($filename, strrchr($filename, '.')) . '_' . $cache_id; if ($this->caching == true && $this->direct_output == false) { $hash_dir = $this->cache_dir . '/' . substr(md5($cachename), 0, 1); #判断缓存文件是否存在 if ($data = @file_get_contents($hash_dir . '/' . $cachename . '.php')) { $data = substr($data, 13); $pos = strpos($data, '<'); $paradata = substr($data, 0, $pos); $para = @unserialize($paradata); #判断缓存是否过期 if ($para === false || $this->_nowtime > $para['expires']) { $this->caching = false; return false; } $this->_expires = $para['expires']; #未过期则将缓存文件读入的字符串赋值给template_out $this->template_out = substr($data, $pos); #判断每一个模板是否过期 foreach ($para['template'] AS $val) { $stat = @stat($val); if ($para['maketime'] < $stat['mtime']) { $this->caching = false; return false; } } } else { $this->caching = false; return false; } return true; } else { return false; } }--------------------------------------------------------- #根据上面的is_cached判断是否从缓存中读取function display($filename, $cache_id = '') { $this->_seterror++; error_reporting(E_ALL ^ E_NOTICE); $this->_checkfile = false; #此处处理文件的呈现 $out = $this->fetch($filename, $cache_id); if (strpos($out, $this->_echash) !== false) { $k = explode($this->_echash, $out); foreach ($k AS $key => $val) { if (($key % 2) == 1) { $k[$key] = $this->insert_mod($val); } } $out = implode('', $k); } error_reporting($this->_errorlevel); $this->_seterror--; echo $out; }--------------------------------------------------------- /** * 处理模板文件 * * @access public * @param string $filename * @param sting $cache_id * * @return sring */ function fetch($filename, $cache_id = '') { if (!$this->_seterror) { error_reporting(E_ALL ^ E_NOTICE); } $this->_seterror++; if (strncmp($filename,'str:', 4) == 0) { $out = $this->_eval($this->fetch_str(substr($filename, 4))); } else { if ($this->_checkfile) { if (!file_exists($filename)) { $filename = $this->template_dir . '/' . $filename; } } else { $filename = $this->template_dir . '/' . $filename; } if ($this->direct_output) { $this->_current_file = $filename; #如果direct_output为真，就直接输出不用缓存 $out = $this->_eval($this->fetch_str(file_get_contents($filename))); } else { #有缓存id和caching为真，则直接读取缓存到$out中 if ($cache_id && $this->caching) { $out = $this->template_out; } else { if (!in_array($filename, $this->template)) { $this->template[] = $filename; } #如果缓存文件不存在则编译源文件 $out = $this->make_compiled($filename); if ($cache_id) { #如果存在cache_id存在则生成一份缓存保存 $cachename = basename($filename, strrchr($filename, '.')) . '_' . $cache_id; $data = serialize(array('template' => $this->template, 'expires' => $this->_nowtime + $this->cache_lifetime, 'maketime' => $this->_nowtime)); $out = str_replace("\r", '', $out); while (strpos($out, "\n\n") !== false) { $out = str_replace("\n\n", "\n", $out); } $hash_dir = $this->cache_dir . '/' . substr(md5($cachename), 0, 1); if (!is_dir($hash_dir)) { mkdir($hash_dir); } if (file_put_contents($hash_dir . '/' . $cachename . '.php', '<?php exit;?>' . $data . $out, LOCK_EX) === false) { trigger_error('can\'t write:' . $hash_dir . '/' . $cachename . '.php'); } $this->template = array(); } } } } $this->_seterror--; if (!$this->_seterror) { error_reporting($this->_errorlevel); } return $out; // 返回html数据 }
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