php字符串压缩方法比较示例
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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