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are seen as strings and not integers prior to PHP 4.3.3, so used as character sequences. This documents bug #24420 git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@132976 c90b9560-bf6c-de11-be94-00142212c4b1
110 lines
3.3 KiB
XML
110 lines
3.3 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.9 $ -->
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<!-- splitted from ./en/functions/array.xml, last change in rev 1.2 -->
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<refentry id="function.range">
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<refnamediv>
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<refname>range</refname>
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<refpurpose>
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Create an array containing a range of elements
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>array</type><methodname>range</methodname>
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<methodparam><type>int</type><parameter>low</parameter></methodparam>
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<methodparam><type>int</type><parameter>high</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>step</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>range</function> returns an array of elements from
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<parameter>low</parameter> to <parameter>high</parameter>,
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inclusive. If low > high, the sequence will be from high to low.
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</para>
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<note>
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<title>New parameter</title>
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<simpara>
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The optional <parameter>step</parameter> parameter was added in 5.0.0.
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</simpara>
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</note>
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<para>
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If a <parameter>step</parameter> value is given, it will be used as the
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increment between elements in the sequence. <parameter>step</parameter>
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should be given as a positive number. If not specified,
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<parameter>step</parameter> will default to 1.
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</para>
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<para>
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<example>
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<title><function>range</function> examples</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// array(0,1,2,3,4,5,6,7,8,9,10,11,12)
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foreach(range(0, 12) as $number) {
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echo $number;
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}
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// The step parameter was introduced in 5.0.0
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// array(0,10,20,30,40,50,60,70,80,90,100)
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foreach(range(0, 100, 10) as $number) {
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echo $number;
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}
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// Use of character sequences introduced in 4.1.0
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// array('a','b','c','d','e','f','g','h','i');
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foreach(range('a', 'i') as $letter) {
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echo $letter;
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}
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// array('c','b','a');
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foreach(range('c', 'a') as $letter) {
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echo $letter;
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<note>
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<para>
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Prior to PHP version 4.1.0, <function>range</function> only generated
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incrementing integer arrays. Support for character sequences and
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decrementing arrays was added in 4.1.0. Character sequence values
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are limited to a length of one. If a length greater than one is
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entered, only the first character is used.
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</para>
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</note>
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<caution>
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<para>
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In PHP versions 4.1.0 through 4.3.2, <function>range</function> sees
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numeric strings as strings and not integers. Instead, they will be
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used for character sequences. For example, <literal>"4242"</literal>
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is treated as <literal>"4"</literal>.
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</para>
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</caution>
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<para>
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See also <function>shuffle</function> and
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<link linkend="control-structures.foreach">foreach</link>.
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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