php-doc-en/reference/ldap/functions/ldap-compare.xml

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<refentry xml:id="function.ldap-compare" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>ldap_compare</refname>
  <refpurpose>Compare value of attribute found in entry specified with DN</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>bool</type><type>int</type></type><methodname>ldap_compare</methodname>
   <methodparam><type>LDAP\Connection</type><parameter>ldap</parameter></methodparam>
   <methodparam><type>string</type><parameter>dn</parameter></methodparam>
   <methodparam><type>string</type><parameter>attribute</parameter></methodparam>
   <methodparam><type>string</type><parameter>value</parameter></methodparam>
   <methodparam choice="opt"><type class="union"><type>array</type><type>null</type></type><parameter>controls</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   Compare <parameter>value</parameter> of <parameter>attribute</parameter>
   with value of same attribute in an LDAP directory entry.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>ldap</parameter></term>
     <listitem>
      <para>
       &ldap.parameter.ldap;
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>dn</parameter></term>
     <listitem>
      <para>
       The distinguished name of an LDAP entity.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>attribute</parameter></term>
     <listitem>
      <para>
       The attribute name.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>value</parameter></term>
     <listitem>
      <para>
       The compared value.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>controls</parameter></term>
     <listitem>
      <para>
       Array of <link linkend="ldap.controls">LDAP Controls</link> to send with the request.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; if <parameter>value</parameter> matches otherwise returns
   &false;. Returns -1 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>
      &ldap.changelog.ldap-object;
      &ldap.changelog.controls-nullable;
      <row>
       <entry>7.3</entry>
       <entry>
        Support for <parameter>controls</parameter> added
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   The following example demonstrates how to check whether or not given password matches
   the one defined in DN specified entry.
  </para>
  <para>
   <example>
    <title>Complete example of password check</title>
    <programlisting role="php">
<![CDATA[
<?php

$ds=ldap_connect("localhost");  // assuming the LDAP server is on this host

if ($ds) {

    // bind
    if (ldap_bind($ds)) {

        // prepare data
        $dn = "cn=Matti Meikku, ou=My Unit, o=My Company, c=FI";
        $value = "secretpassword";
        $attr = "password";

        // compare value
        $r=ldap_compare($ds, $dn, $attr, $value);

        if ($r === -1) {
            echo "Error: " . ldap_error($ds);
        } elseif ($r === true) {
            echo "Password correct.";
        } elseif ($r === false) {
            echo "Wrong guess! Password incorrect.";
        }

    } else {
        echo "Unable to bind to LDAP server.";
    }

    ldap_close($ds);

} else {
    echo "Unable to connect to LDAP server.";
}
?>

]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <warning>
   <para>
    <function>ldap_compare</function> can NOT be used to compare BINARY values!
   </para>
  </warning>
 </refsect1>

</refentry>
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