<?php
 
$text = 'll the Lorem Ipsum ##generators## on the Internet tend to repeat predefined chunks as necessary, making this the first true generator on the Internet. It uses a dictionary of over ##200 Latin words##, combined with a handful of model sentence structures, to generate Lorem Ipsum which looks reasonable. The generated Lorem Ipsum is therefore always ##free from repetition##, injected humour, or non-characteristic words etc.';
 
preg_match_all('/##[^#]+##/', $text, $matches, PREG_SET_ORDER);
 
for ($i = 0; $i < count($matches); $i++) {
  $text = preg_replace("/".$matches[$i][0]."/", "___".strval($i+1)."___" , $text, 1);
}
 
echo $text;
 
?>

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