php壓縮和解壓縮字串的程式碼

下面php代码通过gzcompress和gzuncompress压缩和解压缩字符串，可以设定压缩级别

$str = 'Hello I am a very very very very long string';
$compressed = gzcompress($str, 9);//压缩级别为9
$uncompressed = gzuncompress($compressed);

echo $str, "n";
echo $uncompressed, "n";
echo base64_encode($compressed), "n";
echo bin2hex($compressed), "n";
echo urlencode($compressed), "n";

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