The string compression method provided by PHP has
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-to compress a string into BZIP2 encoded data
Bzcompress () compresses the specified string and returns the data in BZIP2 encoding.
The following four methods of compression comparison, respectively, the Chinese and English digital compression
Copy CodeThe code is as follows:
$str 1 = ' Layout 1 describes the layout, which is simply to set the size and position of the element. EXT's layout system consists of components, layouts, containers, and containers that are a special component that can manage the size and position of the component. The container is dolayout to recalculate the layout and update the DOM. 2 manual layout is unnecessary, and the framework automatically handles it for you. ';
$str 2 = '!@#$%^&* () qwertyuiopsdfghjkl!@#$%^&* () qwertyuiopsdfghjkl:zxcvbnma!@#$%^&* () ertyuiodfghjklxcvbnm@#$%^&* () rtyuiopd:zxcvbnm#!@#!@#$%^&* () qwertyuiopsdfghjkl:zxcvbnm-!@#$%^&* () ertyuiodfghjklxcvbnm@#$%^&* () rtyuiopd$%^&* () ertyuiodfghj!@#$%^&* () qwertyuiopsdfghjkl:zxcvbnm]!@#$% ^&* () ertyuiodfghjklxcvbnm@#$%^&* () rtyuiopdklxcvbnm@#$%^&* () rtyuiopdfghjklcvbnmfghjtyu%^& Rfghj4d56g7h8ui7h8ujirqwerqh8 ';
Echo '
Compress Chinese comparison
';
Compress_comp ($str 1, 1000); Compress 1000 times and decompress 1000 times comparison
Echo '
Comparison of compressed English numerals
';
Compress_comp ($str 2, 1000); Compress 1000 times and decompress 1000 times comparison
/* Compression */
function Compress_comp ($STR, $num) {
$func _compress = Array (' gzcompress ', ' gzencode ', ' gzdeflate ', ' bzcompress ');
Echo ' original: '. $str. '
';
Echo ' Original size: '. strlen ($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); 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-$starttime) *1000,5). ' Ms
';
}
}
/* Get Microtime */
function Get_microtime () {
List ($usec, $sec) = Explode (', microtime (true));
return $usec + $sec;
}
?>
Execution Result:
Copy CodeThe code is as follows:
Compress Chinese comparison
The original: Layout 1 describes the layout, simply to set the size and position of the element. EXT's layout system consists of components, layouts, containers, and containers that are a special component that can manage the size and position of the component. The container is dolayout to recalculate the layout and update the DOM. 2 manual layout is unnecessary, and the framework automatically handles it for you.
Original size: 328
gzcompress Compressed Size: 251 Time: 59.99994ms
Gzencode Compressed Size: 263 Time: 120.00012ms
Gzdeflate Compressed Size: 245 Time: 119.99989ms
Bzcompress Compressed Size: 303 Time: 259.99999ms
Comparison of compressed English numerals
Original:!@#$%^&* () qwertyuiopsdfghjkl!@#$%^&* () qwertyuiopsdfghjkl:zxcvbnma!@#$%^&* () ertyuiodfghjklxcvbnm@#$%^&* () rtyuiopd:zxcvbnm#!@#!@#$%^&* () qwertyuiopsdfghjkl:zxcvbnm-!@#$%^&* () ertyuiodfghjklxcvbnm@#$%^&* () rtyuiopd$%^&* () ertyuiodfghj!@#$%^&* () qwertyuiopsdfghjkl:zxcvbnm]!@#$% ^&* () ertyuiodfghjklxcvbnm@#$%^&* () rtyuiopdklxcvbnm@#$%^&* () rtyuiopdfghjklcvbnmfghjtyu%^& Rfghj4d56g7h8ui7h8ujirqwerqh8
Original size: 386
gzcompress Compressed Size: 116 Time: 50.00019ms
Gzencode Compressed Size: 128 Time: 99.9999ms
Gzdeflate Compressed Size: 110 Time: 89.99991ms
bzcompress Compressed Size: 183 Time: 210.00004ms
Can draw
The gzcompress speed is the fastest and the compression ratio is high.
Gzdeflate compression ratio is highest, speed is slightly slower than gzcompress
Gzencode and Gzdeflate Closer, gzdeflate a slight advantage
Bzcompress speed is the slowest, the compression ratio is the slowest.
It is therefore recommended to use gzcompress and gzdeflate.
http://www.bkjia.com/PHPjc/726023.html www.bkjia.com true http://www.bkjia.com/PHPjc/726023.html techarticle PHP provides a string compression method with 1.gzcompress-compress A string this function Compress the given string using the ZLIB data format. 2 . gzencode-create a gzip compressed ...
