A detailed discussion of PHP arrays_PHP tutorial

With the development of the times, we have more and more programming technologies. Everyone must be familiar with PHP. Let’s introduce PHP arrays here. PHP arrays are the most common batch data storage structure. Since arrays are stored sequentially, they can be conveniently stored randomly. In many languages, arrays are static and the length of the array must be specified before use. In PHP, you don't have to worry about this problem at all, the array is completely dynamic. You can even use an array this way.

<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>

Let’s use PHP arrays to simulate the shuffling of mahjong, a sport that is very popular among the working people in China. Let’s first popularize the rules of mahjong, which will be useful when serving MM’s mother in the future:). First of all, mahjong needs 4 people to play, 3P is not allowed. There are a total of 108 cards. After drawing the cards, the dealer has 14 cards and the other three people have 13 cards each, leaving 55 cards left. (There are N ways to play Mahjong across the country. Here is the way of playing Mahjong in Easy’s hometown. There are no white and other flower tiles. It is the simplest way of playing Mahjong that Easy has ever seen.) Then let’s analyze how to use random numbers to simulate this. process, you might as well do more exercises like this, because extracting mathematical models from specific examples is the basic skill of programming. First, we use an array with a length of 108 to store these 108 cards. When initializing, we might as well assume that they are arranged in order.

Then, we simulate the process of shuffling the cards, which is actually a process of exchanging two cards several times. We generate two random numbers between 1 and 108, and then exchange the values ​​of the array elements indexed by these two numbers. Because it requires multiple exchanges, we can define this process as a function. Next, the 108 cards are distributed to 4 people. In fact, as long as the number of exchanges in the front is large enough, it is OK to just cut them into 5 parts. However, in order to better simulate reality and express the characteristics of arrays, we use a loop to distribute. That means everyone gets four cards at a time, then one for each person and two for the dealer. Okay, that’s it for the whole process. Below we use the program to explain some more details.

<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></SPAN><LI class=alt><SPAN>/** ************************************************************  </SPAN><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 class=alt><SPAN>* @ Easy@bjpeu.edu.cn  </SPAN><LI class=""><SPAN>* @ 2003-6-3  </SPAN><LI class=alt><SPAN>** *************************************************************/  </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>// 换牌函数  </SPAN><LI class=""><SPAN>function swap()  </SPAN><LI class=alt><SPAN>{  </SPAN><LI class=""><SPAN>// 将$majiangArray定义为全局变量  </SPAN><LI class=alt><SPAN>// 这样可以在函数中进行操作  </SPAN><LI class=""><SPAN>global $majiangArray;  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>// 产生两个1到108的随机数  </SPAN><LI class=alt><SPAN>$</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></SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>index2</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>rand</FONT></SPAN><SPAN>( 1 , 108 );  </SPAN></SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>// 交换相应的数组元素的值  </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>tmp</FONT></SPAN><SPAN> = $majiangArray[ $index1 ];  </SPAN></SPAN><LI class=""><SPAN>$majiangArray[ $index1 ] = $majiangArray[ $index2 ];  </SPAN><LI class=alt><SPAN>$majiangArray[ $index2 ] = $tmp;  </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>// 将数组的内容用相应的图片表示出来的函数  </SPAN><LI class=alt><SPAN>function showArray( $arrayName )  </SPAN><LI class=""><SPAN>{  </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>count</FONT></SPAN><SPAN class=attribute-value><FONT color=#0000ff>count</FONT></SPAN><SPAN> = count ( $arrayName );  </SPAN></SPAN><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></SPAN><LI class=alt><SPAN>{  </SPAN><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>></span></font></strong><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></SPAN><LI class=alt><SPAN>{  </SPAN><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></SPAN><LI class=alt><SPAN>{  </SPAN><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 ; $k++ )// 每种牌有四张  </SPAN></SPAN><LI class=alt><SPAN>{  </SPAN><LI class=""><SPAN>$majiangArray[] = $i . '_' . $j . '.gif';  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>// 开始洗牌  </SPAN><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></SPAN><LI class=alt><SPAN>{  </SPAN><LI class=""><SPAN>swap();  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>// 初始化四个用户  </SPAN><LI class=""><SPAN>unset( $user1 );  </SPAN><LI class=alt><SPAN>unset( $user2 );  </SPAN><LI class=""><SPAN>unset( $user3 );  </SPAN><LI class=alt><SPAN>unset( $user4 );  </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>// $seek是进度指针，纪录当前应该从那里发牌  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>seek</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>1</FONT></SPAN><SPAN>;  </SPAN></SPAN><LI class=alt><SPAN> </SPAN><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></SPAN><LI class=alt><SPAN>{  </SPAN><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></SPAN><LI class=alt><SPAN>{  </SPAN><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 ; $k++ )// 一次四张  </SPAN></SPAN><LI class=alt><SPAN>{  </SPAN><LI class=""><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>name</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>'user'</FONT></SPAN><SPAN>.$j;  </SPAN></SPAN><LI class=alt><SPAN>${$name}[] = $majiangArray[ $seek++ ];  </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN>}  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>// 然后一人一张  </SPAN><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 ; $i++ )  </SPAN></SPAN><LI class=""><SPAN>{  </SPAN><LI class=alt><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>name</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>'user'</FONT></SPAN><SPAN>.$i;  </SPAN></SPAN><LI class=""><SPAN>${$name}[] = $majiangArray[ $seek++ ];  </SPAN><LI class=alt><SPAN>}  </SPAN><LI class=""><SPAN> </SPAN><LI class=alt><SPAN>// 最后庄家多摸一张  </SPAN><LI class=""><SPAN>$user4[] = $majiangArray[ $seek ];  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN>// 分牌结束 显示结果  </SPAN><LI class=alt><SPAN>showArray( $user1 );  </SPAN><LI class=""><SPAN>showArray( $user2 );  </SPAN><LI class=alt><SPAN>showArray( $user3 );  </SPAN><LI class=""><SPAN>showArray( $user4 );  </SPAN><LI class=alt><SPAN> </SPAN><LI class=""><SPAN></SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></font></strong></span><span> </span>
</li>
</ol>

http://www.bkjia.com/PHPjc/446499.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446499.htmlTechArticleWith the development of the times, we have more and more programming technologies. Everyone must be familiar with PHP. , let’s introduce PHP arrays here. PHP array is the most common batch data storage...