Several ways to compress strings in PHP

$str = 'Compress meCompress meCompress meCompress meCompress meCompress meCompress meCompress meCompress me';
echo "str".strlen($str)."n";

Method 1 has the lowest compression rate (gzip compression algorithm) and the generated results can be written directly to the .gz file.

$data = implode("", file("bigfile.txt"));
$gzdata = gzencode($data, 9);
$fp = fopen("bigfile. txt.gz", "w");
fwrite($fp, $gzdata);
fclose($fp);
?>

Method 2, compression ratio is centered – This function compress the given string using the ZLIB data format.

$compressed = gzcompress('Compress me', 9);
echo $compressed;
?>

Method 3, the compression rate is tied for the highest

$compressed = gzdeflate('Compress me', 9);
echo $compressed;
?>

Method 4, the compression rate is tied for the highest— Compress a string into bzip2 encoded data

$str = "sample data";
$bzstr = bzcompress($str, 9);
echo $bzstr;
?>

Note , there is no test to see if there is distortion in compression. Those with high compression rates should be more likely to be distorted after restoration. Use it according to the volume.

When using it, please pay attention to test the specific effect.