mysql_compress and mysql_uncompress

compress.php

<?php
declare(strict_types=1);


function mysql_compress($base64 = null): string
{
    if (!$base64) {
        return '';
    }
    $size = pack('V', strlen((string)$base64));
    $body = gzcompress($base64, 9, ZLIB_ENCODING_DEFLATE);
    return base64_encode($size . $body);
}

$content = file_get_contents('php://stdin');
echo mysql_compress($content);

uncompress.php

<?php
declare(strict_types=1);


function mysql_uncompress($base64 = null): string
{
    if (!$base64) {
        return '';
    }
    $binary = base64_decode((string)$base64);
    $size = current(unpack('V', substr($binary, 0, 4)));
    $body = substr($binary, 4);
    // FIXME: Should be `gzuncompress($body, $size)` but some data is invalid.
    $result = gzuncompress($body);
    return $result;
}

$content = file_get_contents('php://stdin');
echo mysql_uncompress($content);