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php字符串压缩方法比较示例

Jun 13, 2016 am 09:44 AM
php Down compression string supply method have Compare of Example

 php 提供的字符串压缩方法有很多,下面为大家比较下php字符串压缩方法,感兴趣的朋友可以参考下

php 提供的字符串压缩方法有    1.gzcompress — Compress a string    This function compress the given string using the ZLIB data format.    2.gzencode — Create a gzip compressed string    This function returns a compressed version of the input data compatible with the output of the gzip program    3.gzdeflate — Deflate a string    This function compress the given string using the DEFLATE data format.    4.bzcompress — 把一个字符串压缩成 bzip2 编码数据    bzcompress() 压缩了指定的字符串并以 bzip2 编码返回数据。    下面对这四种方法进行压缩比较,分别进行中文和英文数字的压缩  复制代码 代码如下: 压缩中文比较

';  compress_comp($str1, 1000); // 压缩1000次 与 解压缩1000次比较    echo '压缩英文数字比较

';  compress_comp($str2, 1000); // 压缩1000次 与 解压缩1000次比较    /* 压缩 */  function compress_comp($str, $num){    $func_compress = array('gzcompress', 'gzencode', 'gzdeflate', 'bzcompress');    echo '原文:'.$str.'

';  echo '原文大小:'.strlen($str).'

';    for($i=0,$length=count($func_compress); $i=5.4  break;  case 'gzdeflate':  $mstr = gzdeflate($str, 9); // 解压方法:gzinflate  break;  case 'bzcompress':  $mstr = bzcompress($str, 9); // 解压方法:bzdecompress  break;  }  }  $endtime = get_microtime();  echo $func_compress[$i].' 压缩后大小:'.strlen($mstr).' 耗时:'.round(($endtime-$starttime)*1000,5).'ms

';  }  }      /* 获取 microtime */  function get_microtime(){  list($usec, $sec) = explode(' ', microtime(true));  return $usec+$sec;  }  ?>    执行结果:  复制代码 代码如下: 压缩中文比较    原文:布局 1 介绍 布局,简单来说就是设置元素的大小和位置。 Ext 的布局系统包括组件,布局,容器,容器是一种特殊的组件,可以管理组件的大小和位置。 容器是通过 doLayout 来重新计算布局,并更新 DOM. 2 手工布局是不必要的,框架会为你自动处理。    原文大小:328    gzcompress 压缩后大小:251 耗时:59.99994ms    gzencode 压缩后大小:263 耗时:120.00012ms    gzdeflate 压缩后大小:245 耗时:119.99989ms    bzcompress 压缩后大小:303 耗时:259.99999ms    压缩英文数字比较    原文:!@#$%^&*()QWERTYUIOPSDFGHJKL!@#$%^&*()QWERTYUIOPSDFGHJKL:ZXCVBNMa!@#$%^&*()ERTYUIODFGHJKLXCVBNM@#$%^&*()RTYUIOPD:ZXCVBNM#!@#!@#$%^&*()QWERTYUIOPSDFGHJKL:ZXCVBNM-!@#$%^&*()ERTYUIODFGHJKLXCVBNM@#$%^&*()RTYUIOPD$%^&*()ERTYUIODFGHJ!@#$%^&*()QWERTYUIOPSDFGHJKL:ZXCVBNM]!@#$%^&*()ERTYUIODFGHJKLXCVBNM@#$%^&*()RTYUIOPDKLXCVBNM@#$%^&*()RTYUIOPDFGHJKLCVBNMFGHJTYU%^&RFGHJ4d56g7h8ui7h8ujirqwerqh8    原文大小:386    gzcompress 压缩后大小:116 耗时:50.00019ms    gzencode 压缩后大小:128 耗时:99.9999ms    gzdeflate 压缩后大小:110 耗时:89.99991ms    bzcompress 压缩后大小:183 耗时:210.00004ms    可以得出    gzcompress 速度最快,压缩比率较高。    gzdeflate 压缩比率最高,速度稍慢于gzcompress    gzencode 与 gzdeflate 比较接近,gzdeflate稍有优势    bzcompress 速度最慢,压缩比率最慢。    因此建议使用 gzcompress 和 gzdeflate。 
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