• How to compress long string in PHP

    When talking about compression, we usually think about files, such as ZIP archives. It is possible to compress long strings in PHP, without involving any archive files.

    In the following example we are going to utilize the gzcompress() and gzuncompress() functions:

    Sample PHP

    <?php
    
    $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<br />";
    
    /* prints
    
    Original size: 800
    
    */
    
    echo "Compressed size: ". strlen($compressed)."n<br />";
    
    /* prints
    
    Compressed size: 418
    
    */
    
    // getting it back
    
    $original = gzuncompress($compressed);
    
    ?>
    									

    We were able to achive almost 50% size reduction. Also the functions

    gzencode() and gzdecode() achive similar results, by using a different

    compression algorithm.

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