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   1  <?php
   2  namespace GuzzleHttp\Stream;
   3  use GuzzleHttp\Stream\Exception\CannotAttachException;
   4  
   5  /**
   6   * Does not store any data written to it.
   7   */
   8  class NullStream implements StreamInterface
   9  {
  10      public function __toString()
  11      {
  12          return '';
  13      }
  14  
  15      public function getContents()
  16      {
  17          return '';
  18      }
  19  
  20      public function close() {}
  21  
  22      public function detach() {}
  23  
  24      public function attach($stream)
  25      {
  26          throw new CannotAttachException();
  27      }
  28  
  29      public function getSize()
  30      {
  31          return 0;
  32      }
  33  
  34      public function isReadable()
  35      {
  36          return true;
  37      }
  38  
  39      public function isWritable()
  40      {
  41          return true;
  42      }
  43  
  44      public function isSeekable()
  45      {
  46          return true;
  47      }
  48  
  49      public function eof()
  50      {
  51          return true;
  52      }
  53  
  54      public function tell()
  55      {
  56          return 0;
  57      }
  58  
  59      public function seek($offset, $whence = SEEK_SET)
  60      {
  61          return false;
  62      }
  63  
  64      public function read($length)
  65      {
  66          return false;
  67      }
  68  
  69      public function write($string)
  70      {
  71          return strlen($string);
  72      }
  73  
  74      public function getMetadata($key = null)
  75      {
  76          return $key ? null : [];
  77      }
  78  }