mirror of
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64071f2fba
git-svn-id: https://svn.php.net/repository/phpdoc/zh/trunk@95699 c90b9560-bf6c-de11-be94-00142212c4b1
129 lines
3.2 KiB
XML
Executable File
129 lines
3.2 KiB
XML
Executable File
<?xml version="1.0" encoding="gb2312"?>
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<!-- $Revision: 1.2 $ -->
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<!-- $Author: dallas $ -->
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<!-- EN-Revision: 1.4 Maintainer: dallas Status: ready -->
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<refentry id="function.array">
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<refnamediv>
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<refname>array</refname>
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<refpurpose>
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新建一个数组
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>说明</title>
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<methodsynopsis>
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<type>array</type><methodname>array</methodname>
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<methodparam choice="opt"><type>mixed</type><parameter>...</parameter></methodparam>
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</methodsynopsis>
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<para>
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返回根据参数建立的数组。参数可以用 <literal>=></literal> 运算符给出索引。
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</para>
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<para>
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<note>
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<para>
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<function>array</function> 是一个语言结构，用于字面上表示数组，不是常规的函数。
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</para>
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</note>
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</para>
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<para>
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语法“index => values”，用逗号分开，定义了索引和值。索引可以是字符串或数字。如果省略了索引，会自动产生从
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0 开始的整数索引。如果索引是整数，则下一个产生的索引将是目前最大的整数索引
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+ 1。注意如果定义了两个完全一样的索引，则后面一个会覆盖前一个。
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</para>
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<para>
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下面的例子演示了怎样建立一个二维数组，怎样给相应的数组指定键名，以及怎样在普通数组中略过和继续数字索引。
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<example>
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<title><function>array</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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$fruits = array (
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"fruits" => array ("a"=>"orange", "b"=>"banana", "c"=>"apple"),
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"numbers" => array (1, 2, 3, 4, 5, 6),
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"holes" => array ("first", 5 => "second", "third")
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);
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title><function>array</function> 的自动索引</title>
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<programlisting role="php">
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<![CDATA[
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$array = array( 1, 1, 1, 1, 1, 8=>1, 4=>1, 19, 3=>13);
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print_r($array);
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]]>
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</programlisting>
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<para>
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将显示：
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<screen role="php">
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<![CDATA[
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Array
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(
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[0] => 1
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[1] => 1
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[2] => 1
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[3] => 13
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[4] => 1
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[8] => 1
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[9] => 19
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)
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]]>
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</screen>
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</para>
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</example>
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注意索引 3 被定义了两次，保留了最后的值 13。索引 4 在 索引
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8 之后定义，下一个自动生成的索引（值为 19 那个）为 9，因为最大的索引是 8。
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</para>
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<para>
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本例建立了从 1 开始的数组。
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<example>
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<title>从 1 开始索引的 <function>array</function></title>
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<programlisting role="php">
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<![CDATA[
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$firstquarter = array(1 => 'January', 'February', 'March');
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print_r($firstquarter);
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]]>
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</programlisting>
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<para>
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将显示：
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<screen>
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<![CDATA[
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Array
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(
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[1] => 'January'
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[2] => 'February'
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[3] => 'March'
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)
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]]>
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</screen>
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</para>
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</example>
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</para>
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<para>
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参见 <function>array_pad</function>，<function>list</function> 和 <function>range</function>。
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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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