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# CVIII. XSLT functions

# Introduction

This PHP extension provides a processor independent API to XSLT transformations. Currently this extension only supports the Sablotron library from the Ginger Alliance. Support is planned for other libraries, such as the Xalan library or the libxslt library.

XSLT (Extensible Stylesheet Language (XSL) Transformations) is a language for transforming XML documents into other XML documents. It is a standard defined by The World Wide Web Consortium (W3C). Information about XSLT and related technologies can be found at http://www.w3.org/TR/xslt.

> Note: This extension is different than the sablotron extension distributed with versions of PHP prior to PHP 4.1, currently only the new XSLT extension in PHP 4.1 is supported. If you need support for the old extension, please ask your questions on the PHP mailing lists.

# Requirements

This extension uses Sablotron and expat, which can both be found at http://www.gingerall.com/. Binaries are provided as well as source.

# Installation

On UNIX, run configure with the --enable-xslt --with-xslt-sablot options. The Sablotron library should be installed somewhere your compiler can find it.

Make sure you have the same libraries linked to the Sablotron library as those, which are linked with php. The configuration options: --with-expat-dir --with-iconv-dir are there to help you specify them. When asking for support, always mention these directives, and whether there are other versions of those libraries installed on your system somewhere. Naturally, provide all the version numbers.

> JavaScript E-XSLT support: If you compiled Sablotron with JavaScript support, you must specify the option: --with-sablot-js.

# Runtime Configuration

This extension has no configuration directives defined in `php.ini`.

# Resource Types

This extension has no resource types defined.

# Predefined Constants

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.

`XSLT_OPT_SILENT` (integer)

  Drop all logging and error reporting. This is a generic option for all backends that may be added in the future.

`XSLT_SABOPT_PARSE_PUBLIC_ENTITIES` (integer)

  Tell Sablotron to parse public entities. By default this has been turned off.

`XSLT_SABOPT_DISABLE_ADDING_META` (integer)

  Do not add the meta tag "Content-Type" for HTML output. The default is set during compilation of Sablotron.

`XSLT_SABOPT_DISABLE_STRIPPING` (integer)

  Suppress the whitespace stripping (on data files only).

`XSLT_SABOPT_IGNORE_DOC_NOT_FOUND` (integer)

  Consider unresolved documents (the document() function) non-lethal.

`XSLT_ERR_UNSUPPORTED_SCHEME` (integer)

  Error return code, for scheme handlers.

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