<?php $text = "[spoiler]Test\ntesting\n\nss\n[/spoiler]."; $text = preg_replace_callback("(\[spoiler\](.*?)\[\/spoiler\])is", function($match){ $lines = explode("\n", str_rot13($match[1])); foreach ($lines as &$line) { if (!empty($line)) $line = "[spoiler]".$line."[/spoiler]"; } unset($line); $output = implode("\n",$lines); return $output; }, $text ); echo $text; ?>
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