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<?php class Foo { protected $bar = 'protected'; private $baz = 'private'; } $F = new Foo(); $F = serialize($F); var_dump($F); $F = str_replace('baz','new_private_prop',$F); $F = preg_replace_callback ( '!s:(\d+):"(.*?)";!', function($match) { return ($match[1] == strlen($match[2])) ? $match[0] : 's:' . strlen($match[2]) . ':"' . $match[2] . '";'; },$F ); $F = @unserialize($F); var_dump($F);

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