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

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  <refentry id="function.range">
   <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>
     </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>
    <example>
     <title><function>range</function> examples</title>
     <programlisting role="php">
<![CDATA[
foreach(range(0, 9) as $number) {
    echo $number;
}
foreach(range('a', 'z') as $letter) {
    echo $letter;
}
foreach(range('z', 'a') as $letter) {
    echo $letter;
}
]]>
     </programlisting>
    </example>
    <note>
     <para>
      Prior to version 4.1.0 the <function>range</function> function
      only generated incrementing integer arrays.  Support for
      character sequences and decrementing arrays was added in 4.1.0.
     </para>
     <example>
      <title>Simulating decrementing ranges and character sequences</title>
      <programlisting role="php">
<![CDATA[
# array_reverse can be used to flip the order of a range
foreach(array_reverse(range(0,9)) as $number) {
    echo $number;
}

# array_map() can be used to turn integers into characters using chr()
foreach(array_map('chr', range(ord('a'),ord('z'))) as $character) {
    echo $character;
}
]]>
      </programlisting>
     </example>
    </note>
    <para>
     See <function>shuffle</function> for another example of its use.
    </para>
   </refsect1>
  </refentry>

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