CODEWITHSUNDEEP
phpmysqlstringalgorithmcompression
coolguy
coolguy

Reputation: 7954

Why a string have the same size applying gzcompress and gzuncompress?

I have a mysql table with a field and I don't have the permission to modify the table schema.

content varchar (255) not null

is there anyway to insert string with more size(greater than 255) to this field. I dont care how its stored(compressed or encoded). I want to retrieve the uncompressed one if it is compressed.

things I tried

gzcompress();

base64_encode();

<?php
$compressed   = gzcompress('asdasdwq3eryt238774284873246827364872687342873rweuydfgjshdbfdgfgs', 9);
$uncompressed = gzuncompress($compressed);
echo $compressed.'---'.strlen($compressed);
echo "<br />";
echo $uncompressed.'----'.strlen($uncompressed);

//BOTH ARE SAME IN SIZE
?>

Upvotes: 1

Views: 340

Answers (1)

Adrian Cid Almaguer
Adrian Cid Almaguer

Reputation: 7791

gzcompress compresses the given string using the ZLIB data format. For details on the ZLIB compression algorithm see the document ZLIB Compressed Data Format Specification version 3.3 (RFC 1950)

You can read one explanation of how ZLIB works in:

http://www.zlib.net/feldspar.html

<?php
$compressed   = gzcompress(' This function compresses the given string using the ZLIB data format. For details on the ZLIB compression algorithm see the document "» ZLIB Compressed Data Format Specification version 3.3" (RFC 1950). ', 9);
$uncompressed = gzuncompress($compressed);
echo $compressed.'---'.strlen($compressed);
echo "<br />";
echo $uncompressed.'----'.strlen($uncompressed);

?>

Upvotes: 1

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