php-doc-en/reference/spl/spldoublylinkedlist/offsetexists.xml

<?xml version='1.0' encoding="utf-8"?>
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<refentry xml:id="spldoublylinkedlist.offsetexists" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>SplDoublyLinkedList::offsetExists</refname>
  <refpurpose>Returns whether the requested $index exists</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>SplDoublyLinkedList::offsetExists</methodname>
   <methodparam><type>mixed</type><parameter>index</parameter></methodparam>
  </methodsynopsis>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>index</parameter></term>
     <listitem>
      <para>
       The index being checked.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &true; if the requested <parameter>index</parameter> exists, otherwise &false;
  </para>
 </refsect1>

</refentry>

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