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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.array-intersect-assoc">
 <refnamediv>
  <refname>array_intersect_assoc</refname>
  <refpurpose>Computes the intersection of arrays with additional index check</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>array_intersect_assoc</methodname>
   <methodparam><type>array</type><parameter>array1</parameter></methodparam>
   <methodparam><type>array</type><parameter>array2</parameter></methodparam>
   <methodparam choice="opt"><type>array</type><parameter>...</parameter></methodparam>
  </methodsynopsis>
  <simpara>
   <function>array_intersect_assoc</function> returns an array
   containing all the values of <parameter>array1</parameter>
   that are present in all the arguments. Note that the keys are also used in
   the comparison unlike in <function>array_intersect</function>.
  </simpara>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array1</parameter></term>
     <listitem>
      <para>
       The array with master values to check.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>array2</parameter></term>
     <listitem>
      <para>
       An array to compare values against.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>...</parameter></term>
     <listitem>
      <para>
       A variable list of arrays to compare.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an associative array containing all the values in 
   <parameter>array1</parameter> that are present in all of the arguments.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_intersect_assoc</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "b" => "yellow", "blue", "red");
$result_array = array_intersect_assoc($array1, $array2);
print_r($result_array);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [a] => green
)
]]>
    </screen>
   </example>
  </para>
  <simpara>
   In our example you see that only the pair <literal>"a" =&gt;
   "green"</literal> is present in both arrays and thus is returned.
   The value <literal>"red"</literal> is not returned because in
   <varname>$array1</varname> its key is <literal>0</literal> while
   the key of "red" in <varname>$array2</varname> is
   <literal>1</literal>, and the key <literal>"b"</literal> is not returned
   because its values are different in each array.
  </simpara>
  <simpara>
   The two values from the <literal>key =&gt; value</literal> pairs are
   considered equal only if
   <literal>(string) $elem1 === (string) $elem2 </literal>. In other words
   a strict type check is executed so the string representation must be
   the same.
   <!-- TODO: example of it... -->
  </simpara>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>array_intersect</function></member>
   <member><function>array_uintersect_assoc</function></member>
   <member><function>array_intersect_uassoc</function></member>
   <member><function>array_uintersect_uassoc</function></member>
   <member><function>array_diff</function></member>
   <member><function>array_diff_assoc</function></member>
  </simplelist>
 </refsect1>
</refentry>

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