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【PHP】 PHP高效文本缓存类
作者:天哲 / 发布于2014/10/10/ 580
一个key对应一行记录, 首先读取首行的配置文件, 得到key对应的行数, 然后取之.写入时同样会计算key对应的行数, 有则更新, 无则增加.fopen + flock控制并发.

	<?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';
	 }else{
	 // 读缓存测试.
	 $ints = $obj->read('key'.$val);
	 echo 'key'.$val.' read size: '. strlen($ints['key']) / 1000 .' KB';
	 }
	}

	#################################### 以下代码为监控作用 ####################################
	echo '执行时间: ';
	echo sprintf('%1.4f',microtime(true) - $atime).' 秒';

	echo '<hr>内存监控: ';
	echo $new = sprintf('%1.4f', memory_get_peak_usage() / 1024) .' KB';
	echo '<hr>原始内存: ';
	echo $old;
	echo '<hr>增加内存: ';
	echo sprintf('%1.4f',$new - $old) .' KB';
	exit();
	?>
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