更有效的方法来设置变量?

时间:2014-10-30 08:32:41

标签: php

我最近创建了一个if语句脚本,它根据数字代表的内容设置变量。在意识到脚本相当长并且最有可能以更有效的方式完成之后,我在互联网上查看并没有找到太多结果。这是我的剧本

            if ($row[position] == 1){
                $variable = 1;
            } elseif ($row[position] == 2){
                $variable = 1;
            } elseif ($row[position] == 3){
                $variable = 2;
            } elseif ($row[position] == 4){
                $variable = 2;
            } elseif ($row[position] == 5){
                $variable = 3;
            } elseif ($row[position] == 6){
                $variable = 3;
            } elseif ($row[position] == 7){
                $variable = 4;
            } elseif ($row[position] == 8){
                $variable = 4;
            } elseif ($row[position] == 9){
                $variable = 5;
            } elseif ($row[position] == 10){
                $variable = 5;
            } elseif ($row[position] == 11){
                $variable = 6;
            } elseif ($row[position] == 12){
                $variable = 6;
            } elseif ($row[position] == 13){
                $variable = 7;
            } elseif ($row[position] == 14){
                $variable = 7;
            } elseif ($row[position] == 15){
                $variable = 8;
            } elseif ($row[position] == 16){
                $variable = 8;
            }

如您所见,这是一个非常基本的模式。

1 = 1
2 = 1
3 = 2
4 = 2
5 = 3
6 = 3 

依旧......

我不是在寻找要完成的工作,因为它可能很多,但我只是想知道我应该怎么做。感谢。

3 个答案:

答案 0 :(得分:6)

这应该对你有用

<?php

    $row["position"] = 4;  //example

    //if (($row["position"] >= 1) && ($row["position"] <= 16) ) -> if you only want to set the variable if it's between 1 and 16 or something else use this if statement
    $variable = ceil($row["position"] / 2);

    echo $variable;

?>

答案 1 :(得分:1)

除了Rizier123的答案,你可以使用round()和PHP_ROUND_HALF_UP模式: -

$numbers = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];

foreach($numbers as $number){
    echo round($number / 2, 0, PHP_ROUND_HALF_UP) . "\n";
}

See it working

答案 2 :(得分:1)

你可以使用%(mod)运算符和除(/)来做技巧

这是诀窍,

1.使位置均匀。即如果位置已经平衡,则另外加1以使其均匀。

2.将位置除以2得到var $ variable的期望值

$pos = $row[position];
if ($pos % 2 == 1) //Check for odd
{ 
     $pos = $pos + 1; //odd+1 =even (converting odd as even)
}

$variable = $pos/2; 

示例:

$ row [position] = 3 =&gt; $ pos是奇数,所以即使是3 + 1也是如此4 =&gt;变量= 4/2 =&gt; 2

$ row [position] = 4 =&gt; $ pos甚至是这样离开,因为它=&gt;变量= 4/2 =&gt; 2

$ row [position] = 5 =&gt; $ pos是奇数,所以即使是5 + 1也是如此6 =&gt;变量= 6/2 =&gt; 3