<?php

function get_zlib_version()
{
    $version = NULL;

    ob_start();
    phpinfo();
    $info = ob_get_contents();
    ob_end_clean();
    //if (preg_match(',zlib.*Compiled Version => (\d+\.\d+\.\d+),s', $info, $match)) {
    //	$version = $match[1];
    if (preg_match(',zlib(?!.*libXML).*Compiled Version (=> |</).*(\d+\.\d+\.\d+?),sU', $info, $match)) {
        $version = $match[2];
    }

    return $version;
}