随着时代的发展，我们的编程技术也越来越多，对于PHP想必大家都很了解吧，我们这里就介绍一下PHP数组吧。PHP数组是最常见的批量数据存储结构，由于数组采用顺序存储，所以可以方便的进行随机存储。在很多语言中，数组都是静态的，必须在使用前指定数组的长度，而在PHP中，你完全不用操心这个问题，数组是完全动态的。你甚至可以这样来使用一个数组。
<ol class="dp-xml"><li class="alt"><span><span>PHP CODE </span></span></li><li class=""><span>// DEMO of Array </span></li><li class="alt"><span>demo_array[] = 1; </span></li><li class=""><span>demo_array[] = 2; </span></li></ol>
下面我们用PHP数组来模拟一下中国广大的劳动人民很喜欢的一种体育运动——麻将的洗牌。这里先普及一下麻将的规则，以后伺候MM的母亲时有用的：）。首先，麻将是要4个人玩的，3P是不行的。总共108张牌，摸完牌后庄家14张，另外3人每人13张，还剩55张。（麻将全国有N种玩法，这里讲的是Easy家乡的玩法，没有中发白等花牌，是Easy见过的玩法中最简单的了。）然后我们来分析一下如何用随机数来模拟这个过程，这样的练习不妨多做，因为从具体事例中提取出数学模型是编程的基本功。首先，我们用一个长度为108的数组来存放这108张牌，初始化的时候不妨假设它们是顺序排放的。
然后，我们来模拟洗牌的过程，这实际上是若干次的两张牌交换的过程。我们产生两个在1~108之间的随机数，然后交换以这两个数为index的数组元素的值就可以了。因为要多次交换，我们可以把这个过程定义为一个函数。接着，就是把这108张牌分给4个人，实际上，只要前边的交换次数足够大，直接切成5份就OK了。不过为了更好的模拟现实和表现数组的特性，我们采用循环的方式来分发。就是每个人一次四张，然后一个人一张，庄家两张。好了，整个过程就是这样的了。下边我们通过程序来说明一些更为细节的东西。
立即学习“PHP免费学习笔记（深入）”；
<ol class="dp-xml"><li class="alt"><span><span>PHP CODE </span></span></li><li class=""><span></span><strong><font color="#006699"><span class="tag"><?</span><span class="tag-name">php</span></font></strong><span> </span></li><li class="alt"><span>/** ************************************************************ </span></li><li class=""><span>* 一个使用数组来模拟麻将洗牌和发牌过程的例子 </span></li><li class="alt"><span>* @ Easy@bjpeu.edu.cn </span></li><li class=""><span>* @ 2003-6-3 </span></li><li class="alt"><span>** *************************************************************/ </span></li><li class=""><span> </span></li><li class="alt"><span>// 换牌函数 </span></li><li class=""><span>function swap() </span></li><li class="alt"><span>{ </span></li><li class=""><span>// 将$majiangArray定义为全局变量 </span></li><li class="alt"><span>// 这样可以在函数中进行操作 </span></li><li class=""><span>global $majiangArray; </span></li><li class="alt"><span> </span></li><li class=""><span>// 产生两个1到108的随机数 </span></li><li class="alt"><span>$</span><span class="attribute"><font color="#ff0000">index1</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">rand</font></span><span>( 1 , 108 ); </span></li><li class=""><span>$</span><span class="attribute"><font color="#ff0000">index2</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">rand</font></span><span>( 1 , 108 ); </span></li><li class="alt"><span> </span></li><li class=""><span>// 交换相应的数组元素的值 </span></li><li class="alt"><span>$</span><span class="attribute"><font color="#ff0000">tmp</font></span><span> = $majiangArray[ $index1 ]; </span></li><li class=""><span>$majiangArray[ $index1 ] = $majiangArray[ $index2 ]; </span></li><li class="alt"><span>$majiangArray[ $index2 ] = $tmp; </span></li><li class=""><span>} </span></li><li class="alt"><span> </span></li><li class=""><span>// 将数组的内容用相应的图片表示出来的函数 </span></li><li class="alt"><span>function showArray( $arrayName ) </span></li><li class=""><span>{ </span></li><li class="alt"><span>$</span><span class="attribute"><font color="#ff0000">count</font></span><span class="attribute-value"><font color="#0000ff">count</font></span><span> = count ( $arrayName ); </span></li><li class=""><span>for ( $</span><span class="attribute"><font color="#ff0000">i</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">0</font></span><span> ; $i </span><span class="tag"><strong><font color="#006699"><</font></strong></span><span> $count ; $i++ ) </span></li><li class="alt"><span>{ </span></li><li class=""><span>echo '</span><strong><font color="#006699"><span class="tag"><</span><span class="tag-name">img</span></font></strong><span> </span><span class="attribute"><font color="#ff0000">src</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"img/'. $arrayName[ $i ] .'"</font></span><span class="tag"><strong><font color="#006699">></font></strong></span><span> ';//显示相应的图片 </span></li><li class="alt"><span>} </span></li><li class=""><span>echo '</span><strong><font color="#006699"><span class="tag"><</span><span class="tag-name">p</span><span class="tag">></span></font></strong><span>';//换行 </span></li><li class="alt"><span>} </span></li><li class=""><span> </span></li><li class="alt"><span>// 主程序部分开始 </span></li><li class=""><span> </span></li><li class="alt"><span>// 初始化数组 </span></li><li class=""><span>unset( $majiangArray ); </span></li><li class="alt"><span>$majiangArray[] = '0'; // 数据从1开始存放，跳过0 </span></li><li class=""><span>for ( $</span><span class="attribute"><font color="#ff0000">i</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">1</font></span><span> ; $i </span><span class="tag"><strong><font color="#006699"><</font></strong></span><span>= 3 ; $i++ )// 共有三种花色 </span></li><li class="alt"><span>{ </span></li><li class=""><span>for ( $</span><span class="attribute"><font color="#ff0000">j</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">1</font></span><span> ; $j </span><span class="tag"><strong><font color="#006699"><</font></strong></span><span>= 9 ; $j++ )// 一个花色中有九种牌 </span></li><li class="alt"><span>{ </span></li><li class=""><span>for ( $</span><span class="attribute"><font color="#ff0000">k</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">1</font></span><span> ; $k </span><span class="tag"><strong><font color="#006699"><</font></strong></span><span>= 4 ; $k++ )// 每种牌有四张 </span></li><li class="alt"><span>{ </span></li><li class=""><span>$majiangArray[] = $i . '_' . $j . '.gif'; </span></li><li class="alt"><span>} </span></li><li class=""><span>} </span></li><li class="alt"><span>} </span></li><li class=""><span> </span></li><li class="alt"><span>// 开始洗牌 </span></li><li class=""><span>for ( $</span><span class="attribute"><font color="#ff0000">i</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">1</font></span><span> ; $i </span><span class="tag"><strong><font color="#006699"><</font></strong></span><span>= 1000 ; $i ++ )// 循环变量i被重新赋值重用 </span></li><li class="alt"><span>{ </span></li><li class=""><span>swap(); </span></li><li class="alt"><span>} </span></li><li class=""><span> </span></li><li class="alt"><span>// 初始化四个用户 </span></li><li class=""><span>unset( $user1 ); </span></li><li class="alt"><span>unset( $user2 ); </span></li><li class=""><span>unset( $user3 ); </span></li><li class="alt"><span>unset( $user4 ); </span></li><li class=""><span> </span></li><li class="alt"><span>// $seek是进度指针，纪录当前应该从那里发牌 </span></li><li class=""><span>$</span><span class="attribute"><font color="#ff0000">seek</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">1</font></span><span>; </span></li><li class="alt"><span> </span></li><li class=""><span>for ( $</span><span class="attribute"><font color="#ff0000">i</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">1</font></span><span> ; $i </span><span class="tag"><strong><font color="#006699"><</font></strong></span><span>= 3 ; $i++ )// 总共摸三次四张的 </span></li><li class="alt"><span>{ </span></li><li class=""><span>for ( $</span><span class="attribute"><font color="#ff0000">j</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">1</font></span><span> ; $j </span><span class="tag"><strong><font color="#006699"><</font></strong></span><span>= 4 ; $j++ )// 四个人 </span></li><li class="alt"><span>{ </span></li><li class=""><span>for ( $</span><span class="attribute"><font color="#ff0000">k</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">1</font></span><span> ; $k </span><span class="tag"><strong><font color="#006699"><</font></strong></span><span>= 4 ; $k++ )// 一次四张 </span></li><li class="alt"><span>{ </span></li><li class=""><span>$</span><span class="attribute"><font color="#ff0000">name</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">'user'</font></span><span>.$j; </span></li><li class="alt"><span>${$name}[] = $majiangArray[ $seek++ ]; </span></li><li class=""><span>} </span></li><li class="alt"><span>} </span></li><li class=""><span>} </span></li><li class="alt"><span> </span></li><li class=""><span>// 然后一人一张 </span></li><li class="alt"><span>for ( $</span><span class="attribute"><font color="#ff0000">i</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">1</font></span><span> ; $i </span><span class="tag"><strong><font color="#006699"><</font></strong></span><span>= 4 ; $i++ ) </span></li><li class=""><span>{ </span></li><li class="alt"><span>$</span><span class="attribute"><font color="#ff0000">name</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">'user'</font></span><span>.$i; </span></li><li class=""><span>${$name}[] = $majiangArray[ $seek++ ]; </span></li><li class="alt"><span>} </span></li><li class=""><span> </span></li><li class="alt"><span>// 最后庄家多摸一张 </span></li><li class=""><span>$user4[] = $majiangArray[ $seek ]; </span></li><li class="alt"><span> </span></li><li class=""><span>// 分牌结束 显示结果 </span></li><li class="alt"><span>showArray( $user1 ); </span></li><li class=""><span>showArray( $user2 ); </span></li><li class="alt"><span>showArray( $user3 ); </span></li><li class=""><span>showArray( $user4 ); </span></li><li class="alt"><span> </span></li><li class=""><span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span></li></ol>
