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

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<section xml:id="mysql.installation" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.install;

 <para xml:id="mysql.configure">
  For compiling, simply use the 
  <option role="configure">--with-mysql[=DIR]</option>
  configuration option where the optional <literal>[DIR]</literal> points to 
  the MySQL installation directory.
 </para>
 <para> 
  Although this MySQL extension is compatible with MySQL 4.1.0 and greater, 
  it doesn't support the extra functionality that these versions provide. 
  For that, use the <link linkend="ref.mysqli">MySQLi</link> extension.
 </para>
 <para>
  If you would like to install the mysql extension along with the mysqli extension
  you have to use the same client library to avoid any conflicts.
 </para>

 <section xml:id="mysql.installation.linux">
  <title>Installation on Linux Systems</title>
  <para>
   Note: <literal>[DIR]</literal> is the path to the MySQL client library 
   files (<emphasis>headers and libraries</emphasis>), which can be downloaded from 
   <link xlink:href="&url.mysql;">MySQL</link>.
  </para>
  <table>
   <title>MySQL compile time support matrix</title>
   <tgroup cols="5">
    <thead>
     <row>
      <entry>PHP Version</entry>
      <entry>Default</entry>
      <entry>Flag: <link linkend="mysqlnd.overview">mysqlnd</link></entry>
      <entry>Flag: <literal>libmysql</literal></entry>
      <entry>Changelog and notes</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>4.x.x</entry>
      <entry>libmysql</entry>
      <entry>&NotAvailable;</entry>
      <entry><option role="configure">--without-mysql</option> to disable</entry>
      <entry>MySQL enabled by default, MySQL client libraries are bundled</entry>
     </row>
     <row>
      <entry>5.0.x, 5.1.x, 5.2.x</entry>
      <entry>libmysql</entry>
      <entry>&NotAvailable;</entry>
      <entry><option role="configure">--with-mysql=[DIR]</option></entry>
      <entry>MySQL is no longer enabled by default, and the MySQL client libraries are <link linkend="faq.databases.mysql.php5">no longer bundled</link></entry>
     </row>
     <row>
      <entry>5.3.x</entry>
      <entry>libmysql</entry>
      <entry><option role="configure">--with-mysql=mysqlnd</option></entry>
      <entry><option role="configure">--with-mysql=[DIR]</option></entry>
      <entry>mysqlnd is now available</entry>
     </row>
     <row>
      <entry>5.4.x</entry>
      <entry>mysqlnd</entry>
      <entry><option role="configure">--with-mysql</option></entry>
      <entry><option role="configure">--with-mysql=[DIR]</option></entry>
      <entry>mysqlnd is now the default</entry>
     </row>
    </tbody>
   </tgroup>
  </table>
 </section>

 <section xml:id="mysql.installation.windows">
  <title>Installation on Windows Systems</title>
  <section>
   <title>PHP 4</title>
   <para>
    The PHP MySQL extension is compiled into PHP.
   </para>
  </section>
  <section>
   <title>PHP 5.0.x, 5.1.x, 5.2.x</title>
   <para>
    MySQL is no longer enabled by default, so the 
    <filename>php_mysql.dll</filename> DLL must be enabled inside of 
    &php.ini;. Also, PHP needs access to the MySQL client library. A file
    named <filename>libmysql.dll</filename> is included in the Windows PHP 
    distribution and in order for PHP to talk to MySQL this file needs to be 
    available to the Windows systems <envar>PATH</envar>. See the FAQ
    titled "<link linkend="faq.installation.addtopath">How do I add my PHP 
    directory to the <varname>PATH</varname> on Windows</link>" for information on how to do
    this. Although copying <filename>libmysql.dll</filename> to the Windows
    system directory also works (because the system directory is by default in 
    the system's <envar>PATH</envar>), it's not recommended.
   </para>
   <para>
    As with enabling any PHP extension (such as 
    <filename>php_mysql.dll</filename>), the PHP directive 
    <link linkend="ini.extension-dir">extension_dir</link> should be set to 
    the directory where the PHP extensions are located. See also the 
    <link linkend="install.windows.manual">Manual Windows Installation
    Instructions</link>. An example extension_dir value for PHP 5 is
    <literal>c:\php\ext</literal>
   </para>
   <note>
    <para>
     If when starting the web server an error similar to the following occurs:
     <literal>"Unable to load dynamic library './php_mysql.dll'"</literal>, 
     this is because <filename>php_mysql.dll</filename> and/or 
     <filename>libmysql.dll</filename> cannot be found by the system.
    </para>
   </note>
  </section>
  <section>
   <title>PHP 5.3.0+</title>
   <para>
    The <link linkend="mysqlnd.overview">MySQL Native Driver</link> is enabled by
    default. Include <filename>php_mysql.dll</filename>, but <filename>libmysql.dll</filename>
    is no longer required or used.
   </para>
  </section>
 </section>

 <section xml:id="mysql.installation.notes">
  <title>MySQL Installation Notes</title>
   <warning>
    <para>
     Crashes and startup problems of PHP 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>
</section>

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