<?php

    
function outputMinifiedHTML($buffer)
{
    $search = array(
        '/\>[^\S ]+/s',  // strip whitespaces after tags, except space
        '/[^\S ]+\</s',  // strip whitespaces before tags, except space
        '/(\s)+/s'       // shorten multiple whitespace sequences
        );
    $replace = array(
        '>',
        '<',
        '\\1'
        );
    $buffer = preg_replace($search, $replace, $buffer);
   $buffer = preg_replace('/<!--(.|\s)*?-->/', '', $buffer );
    return $buffer;
}
ob_start("outputMinifiedHTML");
?>