php-doc-en/reference/array/functions/array-unshift.xml

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<refentry xml:id="function.array-unshift" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>array_unshift</refname>
  <refpurpose>Prepend one or more elements to the beginning of an array</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>array_unshift</methodname>
   <methodparam><type>array</type><parameter role="reference">array</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>var</parameter></methodparam>
   <methodparam choice="opt"><type>mixed</type><parameter>...</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>array_unshift</function> prepends passed elements to the front
   of the <parameter>array</parameter>. Note that the list of elements is
   prepended as a whole, so that the prepended elements stay in the same
   order.  All numerical array keys will be modified to start counting from
   zero while literal keys won't be touched.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>array</parameter></term>
     <listitem>
      <para>
       The input array.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>var</parameter></term>
     <listitem>
      <para>
       The prepended variable.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the new number of elements in the <parameter>array</parameter>.
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_unshift</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$queue = array("orange", "banana");
array_unshift($queue, "apple", "raspberry");
print_r($queue);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen role="php">
<![CDATA[
Array
(
    [0] => apple
    [1] => raspberry
    [2] => orange
    [3] => banana
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>array_shift</function></member>
    <member><function>array_push</function></member>
    <member><function>array_pop</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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