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   1  Symfony Polyfill / Php55
   2  ========================
   3  
   4  This component provides functions unavailable in releases prior to PHP 5.5:
   5  
   6  - [`boolval`](https://php.net/boolval)
   7  - [`json_last_error_msg`](https://php.net/json_last_error_msg)
   8  - [`array_column`](https://php.net/array_column)
   9  - [`hash_pbkdf2`](https://php.net/hash_pbkdf2)
  10  - `password_*` functions (from [ircmaxell/password_compat](https://github.com/ircmaxell/password_compat))
  11  
  12  More information can be found in the
  13  [main Polyfill README](https://github.com/symfony/polyfill/blob/master/README.md).
  14  
  15  License
  16  =======
  17  
  18  This library is released under the [MIT license](LICENSE).