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run code in 300+ PHP versions simultaneously
<?php $corrupted = <<<STRING a:4:{i:0;s:3:"three";i:1;s:5:"five";i:2;s:2:"newline1 newline2";i:3;s:6:"garçon";} STRING; $repaired = preg_replace_callback( '/s:(\d+):"(.*?)";/s', function ($m) { $len = strlen($m[2]); return $m[1] == $len ? $m[0] : "s:$len:\"{$m[2]}\";"; }, $corrupted ); echo $corrupted , "\n" , $repaired; echo "\n---\n"; var_export(unserialize($repaired));

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