代码
<?php $old = sprintf('%1.4f', memory_get_peak_usage() / 1024) .' KB'; class caches{ public $keep_time = 3600; public $file_path = './cache.txt'; private $handle = null; private $time = 0; public function __construct(){ $this->time = time(); } public function read($key, $keep_time=0){ # 取得第一行. 判断过期, 不存在, 异常情况, 影响返回值即可. 返回值决定write方法的调用. $keep_time === 0 && $keep_time = $this->keep_time; $list = $this->__get_one(); # 是否更新判断. $check = true; if(!$list[$key]) $check = false; if($check && (time() - $list[$key]['t']) >= $keep_time) $check = false; # 取得第几行数据. $line = $list[$key]['l']+0; $i = 1; $data = ''; if($this->handle){ while(!feof($this->handle)){ if($i === $line){ $data = fgets($this->handle); }else{ // TODO: 有没有好办法跳过这步... fgets($this->handle); } $i ++; } } # 无论如何都保障数据为数组返回. if($data){ $data = $this->__data_parse($data,'DECODE'); } !$data && $data = array(); return $data; } public function write($key, $val){ # 取得第一行. 判断key是否已经存在了.. $list = $this->__get_one(); # 什么情况下可以写入. if($list[$key]){ # 已经过期的情况下. write函数被调用后, 不管如何都当作过期. $list[$key]['t'] = $this->time; $list['end'] = $list[$key]['l']; }else{ $list[$key] = array('t'=>$this->time,'l'=>($list['end']+1)); $list['end'] = $list[$key]['l']; } # 数据加密处理后再传给__write. $list['end'] 表示更新哪一行. return $this->__write($list['end'], $this->__data_parse($val), serialize($list)); } private function __get_one(){ $this->__read_fopens(); if(!$this->handle) return array(); $list = array(); if($seria = rtrim(fgets($this->handle))){ $list = unserialize($seria); unset($seria); } !$list && $list = array(); return $list; } private function __data_parse($data, $cls='ENCODE'){ # $State 参数以减少is_string, count两函数的调用. if($cls === 'ENCODE'){ # 一定要返回无换行的一行. 切记 # gzcompress 非常占内存, 只是写入时执行. $data = base64_encode(gzcompress(serialize($data),9)); }else{ $data = unserialize(gzuncompress(base64_decode(rtrim($data)))); if($State === false && count($data) === 1 && isset($data[0]) === true){ $data = $data[0]; } } return $data; } private function __write($line, $data, $firstline){ $savedata = array(); $line +=0; $i = 1; $savedata[0] = $firstline; if($this->handle){ while(!feof($this->handle)){ $savedata[$i] = rtrim(fgets($this->handle)); if($i === $line){ $savedata[$i]= $data; } $i ++; } } if(!$savedata[$line]) $savedata[$line] = $data; if($this->handle) $this->__closes(); # 重新写入文件. if(!$fp = fopen($this->file_path, 'wb')) if(!$fp = fopen($this->file_path, 'wb')) if(!$fp = fopen($this->file_path, 'wb')) if(!$fp = fopen($this->file_path, 'wb')) if(!$fp = fopen($this->file_path, 'wb')) return 0; flock($fp, LOCK_EX | LOCK_NB); $ints = 0; //$ints = fwrite($fp, implode(PHP_EOL, $savedata)); foreach($savedata AS $key => $val){ if($key === 0){ $ints += fwrite($fp,$val); }else{ $ints += fwrite($fp,PHP_EOL.$val); } if($key === 0 && $ints <= 0) break; } unset($savedata); flock($fp, LOCK_UN); fclose($fp); return $ints; } private function __read_fopens(){ $cls = 'rb'; if($this->handle) $this->__closes(); if(is_file($this->file_path) === false) return false; if(!$this->handle = fopen($this->file_path,$cls)) if(!$this->handle = fopen($this->file_path,$cls)) if(!$this->handle = fopen($this->file_path,$cls)) if(!$this->handle = fopen($this->file_path,$cls)) if(!$this->handle = fopen($this->file_path,$cls)) $this->handle = null; if($this->handle) flock($this->handle,LOCK_EX | LOCK_NB); } private function __closes(){ if($this->handle){ flock($this->handle, LOCK_UN); fclose($this->handle); $this->handle = null; } } } ########################################### 调用代码 ######################################### set_time_limit(0); $atime = microtime(true); $obj = new caches(); $read = 1; // (0 / 1) 写入或者读, 测试效果. $size = 10000; // 10K $arr = range(1,100); // 首次要快得多, 200:1秒, 1000:11秒 foreach($arr AS $val){ if($read == 0){ // 写入测试. $ints = $obj->write('key'.$val,array('key'=>str_repeat('A',$size))); echo 'key'.$val.' write size: '. ($ints / 1000).' KB<br />'; }else{ // 读缓存测试. $ints = $obj->read('key'.$val); echo 'key'.$val.' read size: '. strlen($ints['key']) / 1000 .' KB<br />'; } } #################################### 以下代码为监控作用 #################################### echo '<br />执行时间: '; echo sprintf('%1.4f',microtime(true) - $atime).' 秒'; echo '<br><br><br><br><hr>内存监控: '; echo $new = sprintf('%1.4f', memory_get_peak_usage() / 1024) .' KB'; echo '<br><hr>原始内存: '; echo $old; echo '<br><hr>增加内存: '; echo sprintf('%1.4f',$new - $old) .' KB'; exit(); ?>
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