php-doc-en/reference/mssql/configure.xml

<?xml version="1.0" encoding="utf-8"?>
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<section xml:id="mssql.installation" xmlns="http://docbook.org/ns/docbook">
 &reftitle.install;
 <para>
  The MSSQL extension is enabled by adding extension=php_mssql.dll to
  &php.ini;.
 </para>
 <para>
  To get these functions to work, you have to compile PHP with
  <option role="configure">--with-mssql[=DIR]</option>, where DIR is the
  FreeTDS install prefix. And FreeTDS should be compiled using
  <option role="configure">--enable-msdblib</option>.
 </para>
 <warning>
  <para>
   MS SQL functions are aliases to Sybase functions if PHP is compiled with
   <link linkend="book.sybase">Sybase</link> extension and without MS SQL
   extension.
  </para>
 </warning>
</section>

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