1.压缩函数(需在php.ini中开启extension=php_zip.dll)
gzencode、gzdeflate和gzcompress
gzencode 默认使用ZLIB_ENCODING_GZIP编码,使用gzip压缩格式,实际上是使用defalte 算法压缩数据,然后加上文件头和adler32校验
gzdeflate 默认使用ZLIB_ENCODING_RAW编码方式,使用deflate数据压缩算法,实际上是先用 LZ77 压缩,然后用霍夫曼编码压缩
gzcompress ;默认使用ZLIB_ENCODING_DEFLATE编码,使用zlib压缩格式,实际上是用 deflate 压缩数据,然后加上 zlib 头和 CRC 校验
这三个函数的比较实质上是三种压缩方法:deflate, zlib, gzip的比较。
从性能的维度看:deflate 好于 gzip 好于 zlib
从文本文件默认压缩率压缩后体积的维度看:deflate 好于 zlib 好于 gzip
举例:
$string = "aaaaaaaaaaaaabbbbbbbbbcccccccddddddddddddeeeeeeeeeeeee啊啊啊啊啊啊啊啊啊啊啊测试测试测试测试长度长度长度";
echo "字符串长度:";
echo strlen($string);
echo "
gzcompress压缩后长度 :";
echo strlen(gzcompress($string,9));
echo "
gzencode压缩后长度:";
echo strlen(gzencode($string,9));
echo "
gzdeflate压缩后长度:";
echo strlen(gzdeflate($string,9));
其中9指的是压缩程度,从0-9
结果:
字符串长度:129
gzcompress压缩后长度 :43
gzencode压缩后长度:55
gzdeflate压缩后长度:37
压缩效果进行排序:gzdeflate、gzcompress、gzencode
与gzcompress想对应的就是gzuncompress解压函数
2.php+redis 消息队列(此部分转载,原文地址http://www.cnblogs.com/lisqiong/p/6039460.html)
把瞬间服务器的请求处理换成异步操作,缓解服务器压力
实现数据顺序排列获取
redis实现消息队列步骤如下:
1)redis函数rpush,lpop
2)创建定时任务入队列
3)创建定时任务出队列
private $redis;
public function __construct($host = '10.102.1.8', $port = 6379) { $this->redis = new Redis(); $this->redis->connect($host, $port); return $this->redis;
}
public function set($key, $value, $timeOut=0) { $retRes = $this->redis->set($key, $value); if ($timeOut > 0) $redis->expire('$key', $timeOut); return $retRes;
}
public function sadd($key,$value){ return $this->redis->sadd($key,$value);
}
public function zadd($key,$value){ return $this->redis->zadd($key,$value);
}
public function smembers($setName){ return $this->redis->smembers($setName);
}
public function lpush($key,$value){
echo "$key - $value n"; return $this->redis->LPUSH($key,$value);
}
public function rpush($key,$value){
echo "$key - $value n"; return $this->redis->rpush($key,$value);
}
public function lranges($key,$head,$tail){ return $this->redis->lrange($key,$head,$tail);
}
public function hset($tableName,$field,$value){ return $this->redis->hset($tableName,$field,$value);
}
public function hget($tableName,$field){ return $this->redis->hget($tableName,$field);
}
public function sets($keyArray, $timeout) { if (is_array($keyArray)) { $retRes = $this->redis->mset($keyArray); if ($timeout > 0) { foreach ($keyArray as $key => $value) { $this->redis->expire($key, $timeout);
}
} return $retRes;
} else { return "Call " . __FUNCTION__ . " method parameter Error !";
}
}
public function get($key) { $result = $this->redis->get($key); return $result;
}
public function gets($keyArray) { if (is_array($keyArray)) { return $this->redis->mget($keyArray);
} else { return "Call " . __FUNCTION__ . " method parameter Error !";
}
}
public function keyAll() { return $this->redis->keys('*');
}
public function del($key) { return $this->redis->delete($key);
}
public function dels($keyArray) { if (is_array($keyArray)) { return $this->redis->del($keyArray);
} else { return "Call " . __FUNCTION__ . " method parameter Error !";
}
}
public function increment($key) { return $this->redis->incr($key);
}
public function decrement($key) { return $this->redis->decr($key);
}
public function isExists($key){ return $this->redis->exists($key);
}
public function updateName($key,$newKey){ return $this->redis->RENAMENX($key,$newKey);
}
public function dataType($key){ return $this->redis->type($key);
}
public function flushAll() { return $this->redis->flushAll();
}
public function redisOtherMethods() { return $this->redis;
}



