Email conversation parser

parser.php

<?php

preg_match_all("/^((?:\h*>+\h*)*)(.*)$/m", $s, $matches, PREG_SET_ORDER);
$indent = 0;
$s = '';
foreach ($matches as $match) {
  $newIndent = substr_count($match[1], '>');
  $diff = $newIndent - $indent;

/*  
  var_dump($match[1]);
  var_dump($newIndent);
  var_dump($match[0]);
  echo "<br />\n";  
*/
      
  if ($diff > 0) {
	$s .= str_repeat('<div style="border:1px solid #000; padding:10px">', $diff);
  } elseif ($diff < 0) {
	$s .= str_repeat('</div>', -$diff);
  }
  $s .= $match[2] . "\n";
  $indent = $newIndent;
}

$s .= str_repeat('</div>', $indent);

test1.php

<?php

$s = '
test
>bla
>blubb
>>bla
>>blubb
>blob
test';

test2.php

<?php
$s = 'sadf asdf asdfAS
DF as>df asdf
FAs df as > df 

AS df asdf asd f
>> sadf asdf
>> sadf asdf
>> asdfasdf 
>> > sadfasdfa
>> > asfasdfasd
>> > asdfasdf

>> sadf asdf

';

test3.php

<?php

$s = '> hjkh k
> kh kjh k
> h kjhk h
>> khj kjhk jh
>> g kjghkjg g
>> uigo goi go
>> kjg klgolgb o
>>> ughoigh oöih
>>> ugh ough o
> uho hol';

test4.php

<?php

$s = '> hjkh k
> kh kjh k
>
> h kjhk h
>> khj kjhk jh
>> g kjghkjg g
>> uigo goi go
>> kjg klgolgb o
>>> ughoigh oöih
>>> ugh ough o
> uho hol 

AS df asdf asd f
>> sadf asdf
>> sadf asdf
>> asdfasdf 
>> >> sadfasdfa
>> >> asfasdfasd
>> >> asdfasdf

>> sadf asdf';