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260 lines
7.0 KiB
XML
Executable File
260 lines
7.0 KiB
XML
Executable File
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 9e0f03ac354d797d1d16c0fcc1663e5e170f2727 Maintainer: HonestQiao Status: ready -->
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<refentry xml:id="function.array-udiff" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>array_udiff</refname>
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<refpurpose>用回调函数比较数据来计算数组的差集</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>array</type><methodname>array_udiff</methodname>
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<methodparam><type>array</type><parameter>array</parameter></methodparam>
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<methodparam rep="repeat"><type>array</type><parameter>arrays</parameter></methodparam>
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<methodparam><type>callable</type><parameter>value_compare_func</parameter></methodparam>
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</methodsynopsis>
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<para>
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使用回调函数比较数据，计算数组的不同之处。和 <function>array_diff</function> 不同的是，前者使用内置函数进行数据比较。
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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>array</parameter></term>
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<listitem>
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<para>
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第一个数组。
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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>arrays</parameter></term>
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<listitem>
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<para>
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要对比的数组。
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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>value_compare_func</parameter></term>
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<listitem>
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<para>
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回调对照函数。
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</para>
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<para>
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&return.callbacksort;
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</para>
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&callback.cmp;
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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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返回 <parameter>array</parameter> 里没有出现在其他参数里的所有值。
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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><function>array_udiff</function> 使用 stdClass 对象的例子</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// 要对比的数组
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$array1 = array(new stdclass, new stdclass,
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new stdclass, new stdclass,
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);
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$array2 = array(
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new stdclass, new stdclass,
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);
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// 为每个对象设置一些属性
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$array1[0]->width = 11; $array1[0]->height = 3;
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$array1[1]->width = 7; $array1[1]->height = 1;
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$array1[2]->width = 2; $array1[2]->height = 9;
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$array1[3]->width = 5; $array1[3]->height = 7;
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$array2[0]->width = 7; $array2[0]->height = 5;
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$array2[1]->width = 9; $array2[1]->height = 2;
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function compare_by_area($a, $b) {
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$areaA = $a->width * $a->height;
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$areaB = $b->width * $b->height;
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if ($areaA < $areaB) {
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return -1;
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} elseif ($areaA > $areaB) {
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return 1;
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} else {
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return 0;
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}
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}
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print_r(array_udiff($array1, $array2, 'compare_by_area'));
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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] => stdClass Object
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(
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[width] => 11
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[height] => 3
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)
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[1] => stdClass Object
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(
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[width] => 7
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[height] => 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><function>array_udiff</function> 使用 DateTime 对象的例子</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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class MyCalendar {
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public $free = array();
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public $booked = array();
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public function __construct($week = 'now') {
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$start = new DateTime($week);
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$start->modify('Monday this week midnight');
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$end = clone $start;
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$end->modify('Friday this week midnight');
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$interval = new DateInterval('P1D');
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foreach (new DatePeriod($start, $interval, $end) as $freeTime) {
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$this->free[] = $freeTime;
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}
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}
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public function bookAppointment(DateTime $date, $note) {
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$this->booked[] = array('date' => $date->modify('midnight'), 'note' => $note);
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}
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public function checkAvailability() {
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return array_udiff($this->free, $this->booked, array($this, 'customCompare'));
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}
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public function customCompare($free, $booked) {
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if (is_array($free)) $a = $free['date'];
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else $a = $free;
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if (is_array($booked)) $b = $booked['date'];
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else $b = $booked;
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if ($a == $b) {
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return 0;
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} elseif ($a > $b) {
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return 1;
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} else {
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return -1;
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}
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}
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}
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// 为每周日程创建日历
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$myCalendar = new MyCalendar;
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// 为本周预约一些日程
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$myCalendar->bookAppointment(new DateTime('Monday this week'), "Cleaning GoogleGuy's apartment.");
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$myCalendar->bookAppointment(new DateTime('Wednesday this week'), "Going on a snowboarding trip.");
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$myCalendar->bookAppointment(new DateTime('Friday this week'), "Fixing buggy code.");
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// 通过对比 $booked 日期和 $free 日期获取空闲的天数
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echo "I'm available on the following days this week...\n\n";
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foreach ($myCalendar->checkAvailability() as $free) {
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echo $free->format('l'), "\n";
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}
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echo "\n\n";
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echo "I'm busy on the following days this week...\n\n";
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foreach ($myCalendar->booked as $booked) {
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echo $booked['date']->format('l'), ": ", $booked['note'], "\n";
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}
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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I'm available on the following days this week...
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Tuesday
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Thursday
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I'm busy on the following days this week...
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Monday: Cleaning GoogleGuy's apartment.
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Wednesday: Going on a snowboarding trip.
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Friday: Fixing buggy code.
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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<note>
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<simpara>
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注意本函数只检查了多维数组中的一维。当然，可以用
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<literal>array_udiff($array1[0], $array2[0], "data_compare_func");</literal>
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来检查更深的维度。
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</simpara>
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</note>
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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>array_diff</function></member>
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<member><function>array_diff_assoc</function></member>
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<member><function>array_diff_uassoc</function></member>
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<member><function>array_udiff_assoc</function></member>
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<member><function>array_udiff_uassoc</function></member>
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<member><function>array_intersect</function></member>
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<member><function>array_intersect_assoc</function></member>
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<member><function>array_uintersect</function></member>
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<member><function>array_uintersect_assoc</function></member>
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<member><function>array_uintersect_uassoc</function></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:"~/.phpdoc/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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