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<refentry xml:id="function.ldap-read" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>ldap_read</refname>
  <refpurpose>Read an entry</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>ldap_read</methodname>
   <methodparam><type>resource</type><parameter>link_identifier</parameter></methodparam>
   <methodparam><type>string</type><parameter>base_dn</parameter></methodparam>
   <methodparam><type>string</type><parameter>filter</parameter></methodparam>
   <methodparam choice="opt"><type>array</type><parameter>attributes</parameter><initializer>array("*")</initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>attrsonly</parameter><initializer>0</initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>sizelimit</parameter><initializer>-1</initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>timelimit</parameter><initializer>-1</initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>deref</parameter><initializer>LDAP_DEREF_NEVER</initializer></methodparam>
   <methodparam choice="opt"><type>array</type><parameter>serverctrls</parameter><initializer>array()</initializer></methodparam>
  </methodsynopsis>
  <para>
   Performs the search for a specified <parameter>filter</parameter> on the
   directory with the scope <constant>LDAP_SCOPE_BASE</constant>. So it is
   equivalent to reading an entry from the directory.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>link_identifier</parameter></term>
     <listitem>
      <para>
       An LDAP link identifier, returned by <function>ldap_connect</function>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>base_dn</parameter></term>
     <listitem>
      <para>
       The base DN for the directory.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>filter</parameter></term>
     <listitem>
      <para>
       An empty filter is not allowed. If you want to retrieve absolutely all
       information for this entry, use a filter of
       <literal>objectClass=*</literal>. If you know which entry types are
       used on the directory server, you might use an appropriate filter such
       as <literal>objectClass=inetOrgPerson</literal>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>attributes</parameter></term>
     <listitem>
      <para>
       An array of the required attributes, e.g. array("mail", "sn", "cn").
       Note that the "dn" is always returned irrespective of which attributes
       types are requested.
      </para>
      <para>
       Using this parameter is much more efficient than the default action
       (which is to return all attributes and their associated values).
       The use of this parameter should therefore be considered good
       practice.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>attrsonly</parameter></term>
     <listitem>
      <para>
       Should be set to 1 if only attribute types are wanted. If set to 0
       both attributes types and attribute values are fetched which is the
       default behaviour.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>sizelimit</parameter></term>
     <listitem>
      <para>
       Enables you to limit the count of entries fetched. Setting this to 0
       means no limit.
      </para>
      <note>
       <para>
        This parameter can NOT override server-side preset sizelimit. You can
        set it lower though.
       </para>
       <para>
        Some directory server hosts will be configured to return no more than
        a preset number of entries. If this occurs, the server will indicate
        that it has only returned a partial results set. This also occurs if
        you use this parameter to limit the count of fetched entries.
       </para>
      </note>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>timelimit</parameter></term>
     <listitem>
      <para>
       Sets the number of seconds how long is spend on the search. Setting
       this to 0 means no limit.
      </para>
      <note>
       <para>
        This parameter can NOT override server-side preset timelimit. You can
        set it lower though.
       </para>
      </note>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>deref</parameter></term>
     <listitem>
      <para>
       Specifies how aliases should be handled during the search. It can be
       one of the following:
       <itemizedlist>
        <listitem>
         <simpara>
          <constant>LDAP_DEREF_NEVER</constant> - (default) aliases are never
          dereferenced.
         </simpara>
        </listitem>
        <listitem>
         <simpara>
          <constant>LDAP_DEREF_SEARCHING</constant> - aliases should be
          dereferenced during the search but not when locating the base object
          of the search.
         </simpara>
        </listitem>
        <listitem>
         <simpara>
          <constant>LDAP_DEREF_FINDING</constant> - aliases should be
          dereferenced when locating the base object but not during the search.
         </simpara>
        </listitem>
        <listitem>
         <simpara>
          <constant>LDAP_DEREF_ALWAYS</constant> - aliases should be dereferenced
          always.
         </simpara>
        </listitem>
       </itemizedlist>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>serverctrls</parameter></term>
     <listitem>
      <para>
       Array of <link linkend="reference.ldap.controls">LDAP Controls</link> to send with the request.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a search result identifier or &false; on error.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>4.0.5</entry>
       <entry>
        Parallel searches support was added.
        See <function>ldap_search</function> for details.
       </entry>
      </row>
      <row>
       <entry>7.3</entry>
       <entry>
        Support for <parameter>serverctrls</parameter> added
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

</refentry>

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