php-doc-en/reference/var/functions/is-array.xml

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  <refentry id="function.is-array">
   <refnamediv>
    <refname>is_array</refname>
    <refpurpose>Finds whether a variable is an array</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>is_array</methodname>
      <methodparam><type>mixed</type><parameter>var</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns &true; if <parameter>var</parameter> is an <type>array</type>, &false;
     otherwise.
    </para>
    <para>
     <example>
      <title>Check that variable is an array</title>
      <programlisting role="php">
<![CDATA[
<?php
$yes = array('this', 'is', 'an array');

echo is_array($yes) ? 'Array' : 'not an Array';
echo "\n";

$no = 'this is a string';

echo is_array($no) ? 'Array' : 'not an Array';
?>
]]>
      </programlisting>
      &example.outputs;
      <screen>
<![CDATA[
Array
not an Array
]]>
      </screen>
     </example>
    </para>
    <para>
     See also 
     <function>is_float</function>,
     <function>is_int</function>,
     <function>is_string</function>, and
     <function>is_object</function>.
    </para>
   </refsect1>
  </refentry>

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