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没事升级了下PHP并顺便安装了eAccelerator组件，没想到竟然让偶折腾了几个小时。。。
安装完成后访问后台空白，访问探针文件502错误，其它都正常，看Nginx日志：

recv() failed (104: Connection reset by peer) while reading response header from upstream

看样子是后端PHP-FPM的问题，接着看其日志：

child 4736 exited on signal 11 (SIGSEGV) after 1336.002675 seconds from start

果真如此，配置让其更详细的输出错误：

catch_workers_output = yes

再次查看PHP-FPM日志：

[notice] EACCELERATOR(5646): PHP crashed on opline 674 of main() 

竟然是eAccelerator的问题，删除之，恢复正常。

<?php
   $columns = array('11', '12', '13');
   foreach ( $columns as &$value) 
   {
      $value  = str_replace('1', '5', $value);
   }
   foreach ($columns as $key => $value)
   {
      $columns[$key]  = str_replace('5', '1', $value);
   }
   print_r($columns);
?>

对于安全性要求不高的情况下足够用了，性能从高到低的两种实现：

<?php
   function xor_enc($string, $operation, $key = 'abcdf') {
      $string = $operation == 'ENCODE' ? $string : base64_decode($string);
      $len1 = strlen($string);
      $len2 = strlen($key);
      if($len1 > $len2) $key = str_repeat($key, ceil($len1 / $len2));
      $string = $operation == 'ENCODE' ? base64_encode($string ^ $key) : $string ^ $key;
      return $string;
   }
?>

   function xor_enc($string, $operation = 'ENCODE', $key = 'abcd') {
      $txt = $operation == 'ENCODE' ? $string : base64_decode($string);
      $len = strlen($key);
      $code = '';
      for ($i = 0; $i < strlen($string); $i ++) {
         $k = $i % $len;
         $code .= $string [$i] ^ $key [$k];
      }
      $code = $operation == 'ENCODE' ? base64_encode($code) : $code;
      return $code;
   }