Comparison between PHP string compression methods-PHP Tutorial-php.cn

Comparison between PHP string compression methods

jacklove

Release： 2023-03-31 09:36:01

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The string compression methods provided by php are

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 — Compress a string into bzip2 encoded data

bzcompress() Compresses the specified string and returns it in bzip2 encoding data.

The following is a compression comparison of these four methods, and compresses Chinese and English numbers respectively

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); $i<$length; $i++){
		$starttime = get_microtime();
		for($j=0; $j<$num; $j++){
			switch($func_compress[$i]){
				case 'gzcompress':
					$mstr = gzcompress($str, 9); // 解压方法：gzuncompress
					break;
				case 'gzencode':
					$mstr = gzencode($str, 9); // 解压方法：gzdecode php>=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;
}
?>

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Execution results:

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

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It can be concluded that

gzcompress has the fastest speed and compression ratio higher.

gzdeflate has the highest compression ratio and is slightly slower than gzcompress

##gzencode Compare with gzdeflate Close, gzdeflate has a slight advantage

bzcompress has the slowest speed and the slowest compression ratio.

Therefore it is recommended to use

gzcompress and gzdeflate.

This article explains the comparison of PHP string compression methods. For more related content, please pay attention to the PHP Chinese website.

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The above is the detailed content of Comparison between PHP string compression methods. For more information, please follow other related articles on the PHP Chinese website!