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

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  <refentry id="function.is-null">
   <refnamediv>
    <refname>is_null</refname>
    <refpurpose>
     Finds whether a variable is &null;
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>is_null</methodname>
      <methodparam><type>mixed</type><parameter>var</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns &true; if <parameter>var</parameter> is <type>null</type>,
     &false; otherwise.
    </para>
    <para>
     See the <link linkend="language.types.null.syntax">&null;</link> type
     when a variable is considered to be &null; and when not.
    </para>
    <para>
     See also <link linkend="language.types.null.syntax">&null;</link>,
     <function>is_bool</function>,
     <function>is_numeric</function>,
     <function>is_float</function>,
     <function>is_int</function>,
     <function>is_string</function>,
     <function>is_object</function>,
     <function>is_array</function>,
     <function>is_integer</function>, and
     <function>is_real</function>.
    </para>
   </refsect1>
  </refentry>

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