How to compress/decompress a long query string in PHP?

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You could try a combination of gzdeflate (raw deflate format) to compress your data and base64_encode to use only those characters that are allowed without Percent-encoding (additionally exchange the characters + and / by - and _):

$output = rtrim(strtr(base64_encode(gzdeflate($input, 9)), '+/', '-_'), '=');

And the reverse:

$output = gzinflate(base64_decode(strtr($input, '-_', '+/')));

Here is an example:

$input="Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";

// percent-encoding on plain text
var_dump(urlencode($input));

// deflated input
$output = rtrim(strtr(base64_encode(gzdeflate($input, 9)), '+/', '-_'), '=');
var_dump($output);

The savings in this case is about 23%. But the actual efficiency of this compression precedure depends on the data you are using.

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