php-doc-en/reference/mysqlnd_uh/mysqlnduhconnection/close.xml

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<refentry xml:id="mysqlnduhconnection.close" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>MysqlndUhConnection::close</refname>
  <refpurpose>Closes a previously opened database connection</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <modifier>public</modifier> <type>bool</type><methodname>MysqlndUhConnection::close</methodname>
   <methodparam><type>mysqlnd_connection</type><parameter>connection</parameter></methodparam>
   <methodparam><type>int</type><parameter>close_type</parameter></methodparam>
  </methodsynopsis>
  <para>
   Closes a previously opened database connection.
  </para>
  <note>
   <para>
    Failing to call the parent implementation may cause memory leaks or
    crash PHP. This is not considered a bug. Please, keep in mind that
    the <literal>mysqlnd</literal> library functions have never been designed
    to be exposed to the user space.
   </para>
  </note>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>connection</parameter></term>
    <listitem>
     <para>
      The connection to be closed. Do not modify!
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>close_type</parameter></term>
    <listitem>
     <para>
      Why the connection is to be closed. The value
      of <parameter>close_type</parameter> is one of
      <constant>MYSQLND_UH_MYSQLND_CLOSE_EXPLICIT</constant>,
      <constant>MYSQLND_UH_MYSQLND_CLOSE_IMPLICIT</constant>,
      <constant>MYSQLND_UH_MYSQLND_CLOSE_DISCONNECTED</constant> or
       <constant>MYSQLND_UH_MYSQLND_CLOSE_LAST</constant>. The
       latter should never be seen, unless the default
       behaviour of the <literal>mysqlnd</literal> library
       has been changed by a plugin.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; on success.
   Otherwise, returns &false;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>MysqlndUhConnection::close</function> example</title>
        <programlisting role="php">
<![CDATA[
<?php
function close_type_to_string($close_type) {
 $mapping = array(
  MYSQLND_UH_MYSQLND_CLOSE_DISCONNECTED => "MYSQLND_UH_MYSQLND_CLOSE_DISCONNECTED",
  MYSQLND_UH_MYSQLND_CLOSE_EXPLICIT => "MYSQLND_UH_MYSQLND_CLOSE_EXPLICIT",
  MYSQLND_UH_MYSQLND_CLOSE_IMPLICIT => "MYSQLND_UH_MYSQLND_CLOSE_IMPLICIT",
  MYSQLND_UH_MYSQLND_CLOSE_LAST => "MYSQLND_UH_MYSQLND_CLOSE_IMPLICIT"
 );
 return (isset($mapping[$close_type])) ? $mapping[$close_type] : 'unknown';
}

class proxy extends MysqlndUhConnection {
  public function close($res, $close_type) {
   printf("%s(%s)\n", __METHOD__, var_export(func_get_args(), true));
   printf("close_type = %s\n", close_type_to_string($close_type));
   /* WARNING: you must call the parent */
   $ret = parent::close($res, $close_type);
   printf("%s returns %s\n", __METHOD__, var_export($ret, true));
   return $ret;
 }
}
mysqlnd_uh_set_connection_proxy(new proxy());

$mysqli = new mysqli("localhost", "root", "", "test");
$mysqli->close();
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
proxy::close(array (
  0 => NULL,
  1 => 0,
))
close_type = MYSQLND_UH_MYSQLND_CLOSE_EXPLICIT
proxy::close returns true
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member>
     <function>mysqlnd_uh_set_connection_proxy</function>
    </member>
    <member>
     <function>mysqli_close</function>
    </member>
    <member>
     <function>mysql_close</function>
    </member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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