php压缩和解压缩字符串的代码

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

1. $str = 'Hello I am a very very very very long string';
2. $compressed = gzcompress($str, 9);//压缩级别为9
3. $uncompressed = gzuncompress($compressed);
5. echo $str, "\n";
6. echo $uncompressed, "\n";
7. echo base64_encode($compressed), "\n";
8. echo bin2hex($compressed), "\n";
9. echo urlencode($compressed), "\n";