<?php $text = null; $c = 1; $r = preg_replace_callback('/(<p( [^>]+)?>)/i', function ($res) { global $c; return '<p'.$res[2].' id="'.intval($c++).'">'; }, $text); $r = preg_replace('/(<p.*?)id="'.($c-1).'"(>)/i', '\1id="Last"\2', $r); $text = $r; echo $text;
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