Question

我正在尝试对三个字符组成的组（如LMH，MMH，HHL等）进行排序，这些组仅包含字符L，M和H，但我需要按照LMH的顺序对其进行排序。这就是我所拥有的，但不确定如何进行比较。重复字符时$ val数组不起作用。这是一个字符串，该字符串被函数分解为数组。

function sortit($str) {
 $val = ['L' => 0, 'M' => 1, 'H' => 2];
 $parts = str_split($str);
 foreach ($parts as $value) {
   $order[$val[$value]] = $value;
 }
 ksort($order);
 return implode('',$parts);
 }

输入：

MLH 
HLL 
MHM 
LHM 
MLH 
LHM 
MHL

所需的输出：

LMH 
LLH 
MMH 
LMH 
LMH 
LMH 
LMH

Answer 1

使用B = imread('peppers.png'); % make superpixels [L,N] = superpixels(B,200); % find neighbors for all superpixels glcms = graycomatrix(L,'NumLevels',N,'GrayLimits',[],'Symmetric',true); % find superpixels k neighboring superpixel number 50 supNum = 50; k=find(glcms(:,supNum)); k(k == supNum) = []; % find pixels that are in superpixel 50 maskPix = L == supNum; % find pixels that are in neighbor superpixels k maskNeighb = ismember(L,k); % plot maskPix3 = repmat(maskPix,1,1,3); maskNeighb3 = repmat(maskNeighb,1,1,3); Bneigbors = B; Bneigbors(maskPix3) = 0; Bneigbors(maskNeighb3) = 255; figure; imshow(Bneigbors) doc：

usort

用作：

function sortit($str) {
   $val = ['L' => 0, 'M' => 1, 'H' => 2];
   $parts = str_split($str);
   usort($parts, function ($a, $b) use ($val) {return $val[$a] - $val[$b];});
   return implode("", $parts);
 }

Answer 2

$val = ['L' => 0, 'M' => 1, 'H' => 2];
$strings = ['HML', 'MHM', 'LHL'];

foreach ($strings as $str) {
    $arr = str_split($str);
    usort($arr, function($val1, $val2) use ($val) {
        return $val[$val1] <=> $val[$val2];
    });
    var_dump(implode('', $arr));
}

您可以使用usort和自定义比较功能对其进行排序。在这里，我使用了val数组，这是一个好主意。

PHP按自定义顺序对三个字母字符进行排序

2 个答案: