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

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<section id="mysql.installation">
 &reftitle.install;
 <para id="mysql.configure">
  By using the <option role="configure">--with-mysql[=DIR]</option>
  configuration option you enable <literal>PHP</literal> to access MySQL
  databases.
 </para>
 <para>
  In PHP 4, the option <option role="configure">--with-mysql</option> is
  enabled by default.  To disable this default behavior, you may use the
  <option role="configure">--without-mysql</option> configure option.  
  Also in PHP 4, if you enable MySQL without specifying the path to the
  MySQL install DIR, <literal>PHP</literal> will use the bundled MySQL client
  libraries.  In Windows, there is no DLL, it's simply built into PHP 4.
  Users who run other applications that use MySQL (for example,
  auth-mysql) should not use the bundled library, but rather specify the
  path to MySQL's install directory, like so:
  <option role="configure">--with-mysql=/path/to/mysql</option>.
  This will force <literal>PHP</literal> to use the client libraries
  installed by MySQL, thus avoiding any conflicts.
 </para>
 <para>
  In PHP 5, MySQL is no longer enabled by default, nor is the MySQL library
  bundled with PHP.  Read this <link linkend="faq.databases.mysql.php5">
  FAQ</link> for details on why.
 </para>
 <para>
  This MySQL extension will not work with MySQL versions greater than
  4.1.0.  For that, use <link linkend="ref.mysqli">MySQLi</link>.
 </para>
 <warning>
  <para>
   Crashes and startup problems of <literal>PHP</literal> may be encountered
   when loading this extension in conjunction with the recode extension.
   See the <link linkend="ref.recode">recode</link> extension for more
   information.
  </para>
 </warning>
 <note>
  <para>
   If you need charsets other than <emphasis>latin</emphasis> (default), you
   have to install external (not bundled) libmysql with compiled charset
   support. 
  </para>
 </note>
</section>

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