根据优先级列表获取最佳数组值

发布于 2024-09-29 10:42:31 字数 912 浏览 2 评论 0原文

我会尽力解释这一点。

我有一个名为 $linkSets 的数组，它的数组整体如下所示：

<string>,<integer>
<string>,<integer>
<string>,<integer>

我还有一个优先级列表，按以下顺序排列： 22 -> 18-> 35-> 34..我想检查 $linkSets 数组中的每个整数，并根据 从同一数组条目中获取最佳的。。

我编写了如下所示的代码：

foreach($linkSets as $link)
{
    $parts = explode(',', $link);
    if($parts[1] == 22) {
        $best = $parts[0];
        break;
    }
    if($parts[1] == 18) {
        $best = $parts[0];
        break;
    }
    if($parts[1] == 35) {
        $best = $parts[0];
        break;
    }
    if($parts[1] == 34) {
        $best = $parts[0];
        break;
    }
}
echo "best: $best";

但正如您可能看到的那样，它不起作用，它不遵守优先级列表。

我想不出有什么方法可以在不多次循环 $linkSets 数组的情况下执行此操作。

原文

I'll try and explain this the best I can.

I have an array called $linkSets, and it has array entires that look like:

<string>,<integer>
<string>,<integer>
<string>,<integer>

I also have a priority list, that goes in this order: 22 -> 18 -> 35 -> 34. I would like to check each integer in the $linkSets array, and get the best <string> from the same array entry based on the <integer>.

I wrote up code that looks like this:

foreach($linkSets as $link)
{
    $parts = explode(',', $link);
    if($parts[1] == 22) {
        $best = $parts[0];
        break;
    }
    if($parts[1] == 18) {
        $best = $parts[0];
        break;
    }
    if($parts[1] == 35) {
        $best = $parts[0];
        break;
    }
    if($parts[1] == 34) {
        $best = $parts[0];
        break;
    }
}
echo "best: $best";

But as you can probably see it doesn't work, it doesn't obey the priority list.

I can't think of any way to do this without looping through the $linkSets array multiple times.

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等你爱我 2024-10-06 10:42:31

有数百种方法可以解决这个问题，这里有一个相对简单的方法：

$tmp = array();
foreach($linkSets as $link)
{
    $parts = explode(',', $link);
    $tmp[$parts[1]] = $parts[0];
}

$priority = array(22, 18, 35, 34);    
$best = false;

foreach($priority as $p) {
    if(isset($tmp[$p])) {
        $best = $tmp[$p];
        break;
    }
}

echo "best: $best";

或者甚至更简单，尽管有点黑客：

$tmp = array(22 => false, 18 => false, 35 => false, 34 => false);
foreach($linkSets as $link) {
    $parts = explode(',', $link);
    $tmp[$parts[1]] = $parts[0];
}    
$best = current(array_filter($tmp)); // Works if your strings are non-false
echo $best;

工作示例：

http://codepad.org/V6tHJAF7

There are hundreds of ways to approach this problem, here's one relatively simple:

$tmp = array();
foreach($linkSets as $link)
{
    $parts = explode(',', $link);
    $tmp[$parts[1]] = $parts[0];
}

$priority = array(22, 18, 35, 34);    
$best = false;

foreach($priority as $p) {
    if(isset($tmp[$p])) {
        $best = $tmp[$p];
        break;
    }
}

echo "best: $best";

Or even simpler, albeit a bit hackier:

$tmp = array(22 => false, 18 => false, 35 => false, 34 => false);
foreach($linkSets as $link) {
    $parts = explode(',', $link);
    $tmp[$parts[1]] = $parts[0];
}    
$best = current(array_filter($tmp)); // Works if your strings are non-false
echo $best;

Working example: