php string compression method comparison example

php provides string compression methods such as

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.

bzcompress - Compacts 1 string into bzip2 encoded data

bzcompress() compacts the specified string and returns the data encoded in bzip2.

The following four methods are used to compress and compare Chinese and English numbers respectively

 
<?php 

$str1 = ' layout  1  introduce   Layout, in simple terms, sets the size and location of elements.  Ext  The layout system includes components, layouts, containers, and containers 1 A special component that manages the size and location of components.   The container is passed through  doLayout  To recalculate the layout and update it  DOM. 2  Manual layout is not necessary, the framework will do it for you automatically. '; 

$str2 = '!@#$%^&*()QWERTYUIOPSDFGHJKL!@#$%^&*()QWERTYUIOPSDFGHJKL:ZXCVBNMa!@#$%^&*()ERTYUIODFGHJKLXCVBNM@#$%^&*()RTYUIOPD:ZXCVBNM#!@#!@#$%^&*()QWERTYUIOPSDFGHJKL:ZXCVBNM-!@#$%^&*()ERTYUIODFGHJKLXCVBNM@#$%^&*()RTYUIOPD$%^&*()ERTYUIODFGHJ!@#$%^&*()QWERTYUIOPSDFGHJKL:ZXCVBNM]!@#$%^&*()ERTYUIODFGHJKLXCVBNM@#$%^&*()RTYUIOPDKLXCVBNM@#$%^&*()RTYUIOPDFGHJKLCVBNMFGHJTYU%^&RFGHJ4d56g7h8ui7h8ujirqwerqh8'; 

echo '<b> Compressed Chinese comparison </b><br><br>'; 
compress_comp($str1, 1000); //  The compression 1000 time   with   unzip 1000 Time to compare  

echo '<b> Compress English numerical comparison </b><br><br>'; 
compress_comp($str2, 1000); //  The compression 1000 time   with   unzip 1000 Time to compare  

/*  The compression  */ 
function compress_comp($str, $num){ 

$func_compress = array('gzcompress', 'gzencode', 'gzdeflate', 'bzcompress'); 

echo ' The original :'.$str.'<br><br>'; 
echo ' The original size :'.strlen($str).'<br><br>'; 

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); //  Decompression method: gzuncompress 
break; 
case 'gzencode': 
$mstr = gzencode($str, 9); //  Decompression method: gzdecode php>=5.4 
break; 
case 'gzdeflate': 
$mstr = gzdeflate($str, 9); //  Decompression method: gzinflate 
break; 
case 'bzcompress': 
$mstr = bzcompress($str, 9); //  Decompression method: bzdecompress 
break; 
} 
} 
$endtime = get_microtime(); 
echo $func_compress[$i].'  Compressed size :'.strlen($mstr).'  Time consuming :'.round(($endtime-$starttime)*1000,5).'ms<br><br>'; 
} 
} 


/*  To obtain  microtime */ 
function get_microtime(){ 
list($usec, $sec) = explode(' ', microtime(true)); 
return $usec+$sec; 
} 
?> 

Execution Results:

 
 Compressed Chinese comparison  

 The original : layout  1  introduce   Layout, in simple terms, sets the size and location of elements.  Ext  The layout system includes components, layouts, containers, and containers 1 A special component that manages the size and location of components.   The container is passed through  doLayout  To recalculate the layout and update it  DOM. 2  Manual layout is not necessary, the framework will do it for you automatically.  

 The original size :328 

gzcompress  Compressed size :251  Time consuming :59.99994ms 

gzencode  Compressed size :263  Time consuming :120.00012ms 

gzdeflate  Compressed size :245  Time consuming :119.99989ms 

bzcompress  Compressed size :303  Time consuming :259.99999ms 

 Compress English numerical comparison  

 The original :!@#$%^&*()QWERTYUIOPSDFGHJKL!@#$%^&*()QWERTYUIOPSDFGHJKL:ZXCVBNMa!@#$%^&*()ERTYUIODFGHJKLXCVBNM@#$%^&*()RTYUIOPD:ZXCVBNM#!@#!@#$%^&*()QWERTYUIOPSDFGHJKL:ZXCVBNM-!@#$%^&*()ERTYUIODFGHJKLXCVBNM@#$%^&*()RTYUIOPD$%^&*()ERTYUIODFGHJ!@#$%^&*()QWERTYUIOPSDFGHJKL:ZXCVBNM]!@#$%^&*()ERTYUIODFGHJKLXCVBNM@#$%^&*()RTYUIOPDKLXCVBNM@#$%^&*()RTYUIOPDFGHJKLCVBNMFGHJTYU%^&RFGHJ4d56g7h8ui7h8ujirqwerqh8 

 The original size :386 

gzcompress  Compressed size :116  Time consuming :50.00019ms 

gzencode  Compressed size :128  Time consuming :99.9999ms 

gzdeflate  Compressed size :110  Time consuming :89.99991ms 

bzcompress  Compressed size :183  Time consuming :210.00004ms 

We can draw

gzcompress is the fastest and has a higher compression ratio.

gzdeflate had the highest compression ratio and was slightly slower than gzcompress

gzencode is close to gzdeflate, while gzdeflate has a slight advantage

bzcompress has the slowest speed and the slowest compression ratio.

Therefore, gzcompress and gzdeflate are recommended.