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<refentry xml:id="function.range" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>range</refname>
  <refpurpose>Create an array containing a range of elements</refpurpose>
 </refnamediv>
 <refsect1>
  <title>Description</title>
  <methodsynopsis>
   <type>array</type><methodname>range</methodname>
   <methodparam><type>mixed</type><parameter>low</parameter></methodparam>
   <methodparam><type>mixed</type><parameter>high</parameter></methodparam>
   <methodparam choice="opt"><type>number</type><parameter>step</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>range</function> returns an array of elements from
   <parameter>low</parameter> to <parameter>high</parameter>,
   inclusive.  If low > high, the sequence will be from high to low.
  </para>
  <note>
   <title>New parameter</title>
   <simpara>
    The optional <parameter>step</parameter> parameter was added in 5.0.0.
   </simpara>
  </note>
  <para>
   If a <parameter>step</parameter> value is given, it will be used as the
   increment between elements in the sequence.  <parameter>step</parameter>
   should be given as a positive number.  If not specified,
   <parameter>step</parameter> will default to 1.
  </para>
  <para>
   <example>
    <title><function>range</function> examples</title>
    <programlisting role="php">
<![CDATA[
<?php
// array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
foreach (range(0, 12) as $number) {
    echo $number;
}

// The step parameter was introduced in 5.0.0
// array(0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100)
foreach (range(0, 100, 10) as $number) {
    echo $number;
}

// Use of character sequences introduced in 4.1.0
// array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i');
foreach (range('a', 'i') as $letter) {
    echo $letter;
}
// array('c', 'b', 'a');
foreach (range('c', 'a') as $letter) {
    echo $letter;
}
?>
]]>
    </programlisting>
   </example>
  </para>
  <note>
   <para>
    Prior to PHP 4.1.0, <function>range</function> only generated
    incrementing integer arrays.  Support for character sequences and
    decrementing arrays was added in 4.1.0.  Character sequence values
    are limited to a length of one.  If a length greater than one is
    entered, only the first character is used.
   </para>
  </note>
  <caution>
   <para>
    In PHP versions 4.1.0 through 4.3.2, <function>range</function> sees
    numeric strings as strings and not integers.  Instead, they will be
    used for character sequences.  For example, <literal>"4242"</literal>
    is treated as <literal>"4"</literal>.
   </para>
  </caution>
  <para>
   See also <function>shuffle</function>,
   <function>array_fill</function>, and
   <link linkend="control-structures.foreach">foreach</link>.
  </para>
 </refsect1>
</refentry>

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