The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.
XSL_CLONE_AUTO
    (integer)
   XSL_CLONE_NEVER
    (integer)
   XSL_CLONE_ALWAYS
    (integer)
   LIBXSLT_VERSION
    (integer)
   LIBXSLT_DOTTED_VERSION
    (string)
   LIBEXSLT_VERSION
    (integer)
   LIBEXSLT_DOTTED_VERSION
    (string)
   XSL_SECPREF_NONE
    (integer)
   XSL_SECPREF_READ_FILE
    (integer)
   XSL_SECPREF_WRITE_FILE
    (integer)
   XSL_SECPREF_CREATE_DIRECTORY
    (integer)
   XSL_SECPREF_READ_NETWORK
    (integer)
   XSL_SECPREF_WRITE_NETWORK
    (integer)
   XSL_SECPREF_DEFAULT
    (integer)
   XSL_SECPREF_WRITE_NETWORK |
     XSL_SECPREF_CREATE_DIRECTORY |
     XSL_SECPREF_WRITE_FILE.