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<refentry id="function.array-intersect-assoc">
 <refnamediv>
  <refname>array_intersect_assoc</refname>
  <refpurpose>Computes the intersection of arrays with additional index check</refpurpose>
 </refnamediv>
 <refsect1>
  <title>Description</title>
  <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 used in
   the comparison unlike in <function>array_intersect</function>.
  </simpara>
  <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", "yellow", "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>.
  </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>
  <simpara>
   See also <function>array_intersect</function>,
   <function>array_uintersect_assoc</function>,
   <function>array_intersect_uassoc</function>,
   <function>array_uintersect_uassoc</function>,
   <function>array_diff</function> and
   <function>array_diff_assoc</function>.
  </simpara>
 </refsect1>
</refentry>

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