字符串压缩 (转)
当我们说到压缩,我们可能会想到文件压缩,其实,字符串也是可以压缩的。PHP提供了 gzcompress() 和gzuncompress() 函数:
- $string =
- “Lorem ipsum dolor sit amet, consectetur
- adipiscing elit. Nunc ut elit id mi ultricies
- adipiscing. Nulla facilisi. Praesent pulvinar,
- sapien vel feugiat vestibulum, nulla dui pretium orci,
- non ultricies elit lacus quis ante. Lorem ipsum dolor
- sit amet, consectetur adipiscing elit. Aliquam
- pretium ullamcorper urna quis iaculis. Etiam ac massa
- sed turpis tempor luctus. Curabitur sed nibh eu elit
- mollis congue. Praesent ipsum diam, consectetur vitae
- ornare a, aliquam a nunc. In id magna pellentesque
- tellus posuere adipiscing. Sed non mi metus, at lacinia
- augue. Sed magna nisi, ornare in mollis in, mollis
- sed nunc. Etiam at justo in leo congue mollis.
- Nullam in neque eget metus hendrerit scelerisque
- eu non enim. Ut malesuada lacus eu nulla bibendum
- id euismod urna sodales. “;
- $compressed = gzcompress($string);
- echo “Original size: “. strlen($string).”\n”;
- /* 输出原始大小
- Original size: 800
- */
- echo “Compressed size: “. strlen($compressed).”\n”;
- /* 输出压缩后的大小
- Compressed size: 418
- */
- // 解压缩
- $original = gzuncompress($compressed);
几乎有50% 压缩比率。同时,你还可以使用 gzencode() 和 gzdecode() 函数来压缩,只不用其用了不同的压缩算法。