# 预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

`XSL_CLONE_AUTO` (int)
`XSL_CLONE_NEVER` (int)
`XSL_CLONE_ALWAYS` (int)
`LIBXSLT_VERSION` (int)
  libxslt version like 10117.
`LIBXSLT_DOTTED_VERSION` (string)
  libxslt version like 1.1.17.
`LIBEXSLT_VERSION` (int)
  libexslt version like 813.
`LIBEXSLT_DOTTED_VERSION` (string)
  libexslt version like 1.1.17.
`XSL_SECPREF_NONE` (int)
  Deactivate all security restrictions.
`XSL_SECPREF_READ_FILE` (int)
  Disallows reading files.
`XSL_SECPREF_WRITE_FILE` (int)
  Disallows writing files.
`XSL_SECPREF_CREATE_DIRECTORY` (int)
  Disallows creating directories.
`XSL_SECPREF_READ_NETWORK` (int)
  Disallows reading network files.
`XSL_SECPREF_WRITE_NETWORK` (int)
  Disallows writing network files.
`XSL_SECPREF_DEFAULT` (int)
  Disallows all write access, i.e. a bitmask of `XSL_SECPREF_WRITE_NETWORK` | `XSL_SECPREF_CREATE_DIRECTORY` | `XSL_SECPREF_WRITE_FILE`.

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