本文实例讲述了php打印输出棋盘的两种实现方法。分享给大家供大家参考。具体实现方法如下:
例子1,代码如下:
代码如下:
/**
* 隔行隔列换色
* string fun_table(int $rows=9,int $cols=9)
* $rows 表示行数 必须为整数 并且必须在1-20之间
* $cols 表示列数 必须为整数 并且必须在1-20之间
*/
function fun_table($rows=9,$cols=9){
if ($rows20){
return "必须为整数 并且必须在1-20之间";
}
if ($cols20){
return "必须为整数 并且必须在1-20之间";
}
if($rows!=(int)($rows)){
return '行数 必须为整数';
}
if($cols!=(int)($cols)){
return '列数 必须为整数';
}
$str="";
$str.= "
"; }else{ $str.= " |
"; |
return $str;
}
echo fun_table();
?>
例子2 简单实现棋盘-for循环
实现这个棋盘首先我们想想棋盘是怎么样的,是有很多个方格组成,然后由黑色和白色的相间的方格组成,首先我们先把方格画出来,代码如下:
代码如下:
echo "
54im | ";
?>
看到上面棋盘后,考虑下黑白格排放位置,有个规律可以发现,横排和竖排上白色格子都是基数,黑色的都是偶数,我们可以用取余的方法来判断这个格子该显示什么颜色,基数单元格我让他显示白色,偶数单元格显示黑色,基数+偶数=偶数,所以偶数单元格(黑色)我们很好找出来了,剩余的就是基数格(白色),代码如下:
代码如下:
/**
通过for循环和html实现棋盘
**/
echo "
"; }else{ echo " |
"; |
?>
希望本文所述对大家的php程序设计有所帮助。

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TostartaPHPsession,usesession_start()atthescript'sbeginning.1)Placeitbeforeanyoutputtosetthesessioncookie.2)Usesessionsforuserdatalikeloginstatusorshoppingcarts.3)RegeneratesessionIDstopreventfixationattacks.4)Considerusingadatabaseforsessionstoragei

Session regeneration refers to generating a new session ID and invalidating the old ID when the user performs sensitive operations in case of session fixed attacks. The implementation steps include: 1. Detect sensitive operations, 2. Generate new session ID, 3. Destroy old session ID, 4. Update user-side session information.


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