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

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