- gzcompress: documentation ( source)
<?php
$original = 'online PHP shell, execute code in 100+ different PHP versions!online PHP shell, execute code in 100+ different PHP versions!online PHP shell, execute code in 100+ different PHP versions!online PHP shell, execute code in 100+ different PHP versions!online PHP shell, execute code in 100+ different PHP versions!';
$packed=gzcompress($original, -1, PHP_ZLIB_ENCODING_RAW);
echo strlen($packed)." ".strlen($original)."\n";