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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@284105 c90b9560-bf6c-de11-be94-00142212c4b1
309 lines
7.5 KiB
XML
309 lines
7.5 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.array-multisort" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>array_multisort</refname>
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<refpurpose>Sort multiple or multi-dimensional arrays</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>array_multisort</methodname>
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<methodparam><type>array</type><parameter role="reference">arr</parameter></methodparam>
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<methodparam choice="opt"><type>mixed</type><parameter>arg</parameter><initializer>SORT_ASC</initializer></methodparam>
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<methodparam choice="opt"><type>mixed</type><parameter>arg</parameter><initializer>SORT_REGULAR</initializer></methodparam>
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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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<function>array_multisort</function> can be used to sort several
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arrays at once, or a multi-dimensional array by one or more
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dimensions.
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</para>
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<para>
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Associative (<type>string</type>) keys will be maintained, but numeric
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keys will be re-indexed.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>arr</parameter></term>
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<listitem>
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<para>
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An <type>array</type> being sorted.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>arg</parameter></term>
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<listitem>
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<para>
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Optionally another <type>array</type>, or sort options for the
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previous <type>array</type> argument:
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<constant>SORT_ASC</constant>,
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<constant>SORT_DESC</constant>,
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<constant>SORT_REGULAR</constant>,
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<constant>SORT_NUMERIC</constant>,
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<constant>SORT_STRING</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>...</parameter></term>
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<listitem>
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<para>
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Additional <parameter>arg</parameter>'s.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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&return.success;
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Sorting multiple arrays</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$ar1 = array(10, 100, 100, 0);
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$ar2 = array(1, 3, 2, 4);
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array_multisort($ar1, $ar2);
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var_dump($ar1);
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var_dump($ar2);
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?>
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]]>
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</programlisting>
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<para>
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In this example, after sorting, the first array will contain 0,
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10, 100, 100. The second array will contain 4, 1, 2, 3. The
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entries in the second array corresponding to the identical
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entries in the first array (100 and 100) were sorted as well.
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</para>
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<screen>
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<![CDATA[
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array(4) {
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[0]=> int(0)
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[1]=> int(10)
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[2]=> int(100)
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[3]=> int(100)
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}
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array(4) {
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[0]=> int(4)
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[1]=> int(1)
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[2]=> int(2)
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[3]=> int(3)
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}
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]]>
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</screen>
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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>Sorting multi-dimensional array</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$ar = array(
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array("10", 11, 100, 100, "a"),
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array( 1, 2, "2", 3, 1)
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);
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array_multisort($ar[0], SORT_ASC, SORT_STRING,
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$ar[1], SORT_NUMERIC, SORT_DESC);
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var_dump($ar);
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?>
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]]>
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</programlisting>
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<para>
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In this example, after sorting, the first array will transform to
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"10", 100, 100, 11, "a" (it was sorted as strings in ascending
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order). The second will contain 1, 3, "2", 2, 1 (sorted as numbers,
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in descending order).
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</para>
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<screen>
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<![CDATA[
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array(2) {
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[0]=> array(5) {
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[0]=> string(2) "10"
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[1]=> int(100)
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[2]=> int(100)
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[3]=> int(11)
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[4]=> string(1) "a"
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}
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[1]=> array(5) {
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[0]=> int(1)
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[1]=> int(3)
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[2]=> string(1) "2"
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[3]=> int(2)
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[4]=> int(1)
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}
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}
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]]>
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</screen>
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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>Sorting database results</title>
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<para>
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For this example, each element in the <varname>data</varname>
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array represents one row in a table. This type of dataset is typical
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of database records.
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</para>
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<para>
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Example data:
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</para>
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<screen>
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<![CDATA[
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volume | edition
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-------+--------
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67 | 2
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86 | 1
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85 | 6
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98 | 2
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86 | 6
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67 | 7
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]]>
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</screen>
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<para>
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The data as an array, called <varname>data</varname>. This would usually,
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for example, be obtained by looping with <function>mysql_fetch_assoc</function>.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$data[] = array('volume' => 67, 'edition' => 2);
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$data[] = array('volume' => 86, 'edition' => 1);
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$data[] = array('volume' => 85, 'edition' => 6);
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$data[] = array('volume' => 98, 'edition' => 2);
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$data[] = array('volume' => 86, 'edition' => 6);
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$data[] = array('volume' => 67, 'edition' => 7);
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?>
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]]>
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</programlisting>
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<para>
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In this example, we will order by <varname>volume</varname> descending,
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<varname>edition</varname> ascending.
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</para>
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<para>
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We have an array of rows, but <function>array_multisort</function>
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requires an array of columns, so we use the below code to obtain the
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columns, then perform the sorting.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Obtain a list of columns
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foreach ($data as $key => $row) {
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$volume[$key] = $row['volume'];
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$edition[$key] = $row['edition'];
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}
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// Sort the data with volume descending, edition ascending
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// Add $data as the last parameter, to sort by the common key
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array_multisort($volume, SORT_DESC, $edition, SORT_ASC, $data);
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?>
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]]>
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</programlisting>
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<para>
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The dataset is now sorted, and will look like this:
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</para>
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<screen>
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<![CDATA[
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volume | edition
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-------+--------
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98 | 2
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86 | 1
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86 | 6
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85 | 6
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67 | 2
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67 | 7
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]]>
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</screen>
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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>Case insensitive sorting</title>
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<para>
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Both <constant>SORT_STRING</constant> and
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<constant>SORT_REGULAR</constant> are case sensitive, strings
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starting with a capital letter will come before strings starting
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with a lowercase letter.
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</para>
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<para>
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To perform a case insensitive search, force the sorting order to be
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determined by a lowercase copy of the original array.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$array = array('Alpha', 'atomic', 'Beta', 'bank');
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$array_lowercase = array_map('strtolower', $array);
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array_multisort($array_lowercase, SORT_ASC, SORT_STRING, $array);
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print_r($array);
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Array
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(
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[0] => Alpha
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[1] => atomic
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[2] => bank
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[3] => Beta
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)
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>usort</function></member>
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<member>&seealso.array.sorting;</member>
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</simplelist>
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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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