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(PHP >= 5.3.0, PECL phar >= 2.0.0)
PharData::isWritable — Returns true if the tar/zip archive can be modified
   This method returns  TRUE  if the tar/zip archive on disk is not read-only.
   Unlike  Phar::isWritable() , data-only tar/zip archives
   can be modified even if phar.readonly is set to 1.
  
No parameters.
   Returns  TRUE  if the tar/zip archive can be modified