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<?php $text = "[spoiler]Test\ntesting[/spoiler]."; $text = preg_replace_callback("(\[spoiler\](.*?)\[\/spoiler\])is", function($match){ $lines = explode("\n", str_rot13($match[1])); foreach ($lines as &$line) { if ($line != "") $line = "[spoiler]".$line."[/spoiler]"; } unset($line); $output = implode($lines); return $output; }, $text ); echo $text; ?>
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
[spoiler]Grfg[/spoiler][spoiler]grfgvat[/spoiler].
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/cLodj on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/cLodj on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/cLodj on line 6
Process exited with code 255.

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