<?php

//Function to seperate multiple tags one line
function fix_newlines_for_clean_html($fixthistext)
{
        $fixthistext_array = explode("\n", $fixthistext);
        foreach ($fixthistext_array as $unfixedtextkey => $unfixedtextvalue)
        {
                //Makes sure empty lines are ignores
                if (!preg_match("/^(\s)*$/", $unfixedtextvalue))
                {
                        $fixedtextvalue = preg_replace("/>(\s|\t)*</U", ">\n<", $unfixedtextvalue);
                        $fixedtext_array[$unfixedtextkey] = $fixedtextvalue;
                }
        }
        return implode("\n", $fixedtext_array);
}

function clean_html_code($uncleanhtml)
{
        //Set wanted indentation
        $indent = "    ";


        //Uses previous function to seperate tags
        $fixed_uncleanhtml = fix_newlines_for_clean_html($uncleanhtml);
        $uncleanhtml_array = explode("\n", $fixed_uncleanhtml);
        //Sets no indentation
        $indentlevel = 0;
        foreach ($uncleanhtml_array as $uncleanhtml_key => $currentuncleanhtml)
        {
                //Removes all indentation
                $currentuncleanhtml = preg_replace("/\t+/", "", $currentuncleanhtml);
                $currentuncleanhtml = preg_replace("/^\s+/", "", $currentuncleanhtml);
               
                $replaceindent = "";
               
                //Sets the indentation from current indentlevel
                for ($o = 0; $o < $indentlevel; $o++)
                {
                        $replaceindent .= $indent;
                }
               
                //If self-closing tag, simply apply indent
                if (preg_match("/<(.+)\/>/", $currentuncleanhtml))
                {
                        $cleanhtml_array[$uncleanhtml_key] = $replaceindent.$currentuncleanhtml;
                }
                //If doctype declaration, simply apply indent
                else if (preg_match("/<!(.*)>/", $currentuncleanhtml))
                {
                        $cleanhtml_array[$uncleanhtml_key] = $replaceindent.$currentuncleanhtml;
                }
                //If opening AND closing tag on same line, simply apply indent
                else if (preg_match("/<[^\/](.*)>/", $currentuncleanhtml) && preg_match("/<\/(.*)>/", $currentuncleanhtml))
                {
                        $cleanhtml_array[$uncleanhtml_key] = $replaceindent.$currentuncleanhtml;
                }
                //If closing HTML tag or closing JavaScript clams, decrease indentation and then apply the new level
                else if (preg_match("/<\/(.*)>/", $currentuncleanhtml) || preg_match("/^(\s|\t)*\}{1}(\s|\t)*$/", $currentuncleanhtml))
                {
                        $indentlevel--;
                        $replaceindent = "";
                        for ($o = 0; $o < $indentlevel; $o++)
                        {
                                $replaceindent .= $indent;
                        }
                       
                        $cleanhtml_array[$uncleanhtml_key] = $replaceindent.$currentuncleanhtml;
                }
                //If opening HTML tag AND not a stand-alone tag, or opening JavaScript clams, increase indentation and then apply new level
                else if ((preg_match("/<[^\/](.*)>/", $currentuncleanhtml) && !preg_match("/<(link|meta|base|br|img|hr)(.*)>/", $currentuncleanhtml)) || preg_match("/^(\s|\t)*\{{1}(\s|\t)*$/", $currentuncleanhtml))
                {
                        $cleanhtml_array[$uncleanhtml_key] = $replaceindent.$currentuncleanhtml;
                       
                        $indentlevel++;
                        $replaceindent = "";
                        for ($o = 0; $o < $indentlevel; $o++)
                        {
                                $replaceindent .= $indent;
                        }
                }
                else
                //Else, only apply indentation
                {$cleanhtml_array[$uncleanhtml_key] = $replaceindent.$currentuncleanhtml;}
        }
        //Return single string seperated by newline
        return implode("\n", $cleanhtml_array); 
}
?>