PHP按多个条件自定义排序字符串数组

Question

我有一个字体名称数组，这些名称根据宽度来计算，然后根据粗细(按字母顺序)来计算。标准 width 在字符串中没有像其他宽度那样的指示符(压缩、扩展等)。这是我得到它时数组的样子:

Array ( 
[0] => Bold 
[1] => ExtraBold 
[2] => ExtraLight 
[3] => Light 
[4] => Medium 
[5] => Regular 
[6] => SemiBold 
[7] => Thin 
[8] => Condensed Bold 
[9] => Condensed ExtraBold 
[10] => Condensed ExtraLight 
[11] => Condensed Light 
[12] => Condensed Medium 
[13] => Condensed Regular 
[14] => Condensed SemiBold 
[15] => Condensed Thin 
[16] => Expanded Black 
[17] => Expanded Bold 
[18] => Expanded ExtraBold 
[19] => Expanded ExtraLight 
[20] => Expanded Light 
[21] => Expanded Medium 
[22] => Expanded Regular 
[23] => Expanded SemiBold 
[24] => Expanded Thin) 

然后我需要先根据这个宽度顺序对它进行排序:

$order_array_crit_one = array("Expanded", "Standard", "Condensed");

然后按照权重的顺序:

$order_array_crit_two = array("Black", "ExtraBold", "Bold", "SemiBold", "Medium", "Regular", "Light", "Thin", "ExtraLight");

我使用比较单词的排序函数 ( like this ) 解决了这个问题，但到目前为止我想出的每一个解决方案都很庞大且令人困惑。

Answer 1

过于复杂的比较的问题是它使 usort 效率不高，因为它必须多次转换和评估项目。但是，如果您之前以使用基本排序的方式转换数组，则可以减少这项工作。一个想法是重建数组，但这次使用计算出的数字键:

// 3 items need 2 bits to be represented:
// ( 0 => 00 => "Expanded", 1 => 01 => "Standard", 2 => 10 => "Condensed" )
$crit1 = ["Expanded", "Standard", "Condensed"];
// 9 items need 4 bits to be represented:
// ( 0 => 0000 => "Black", ... 8 => 1000 => "ExtraLight" )
$crit2 = ["Black", "ExtraBold", "Bold", "SemiBold", "Medium", "Regular", "Light", "Thin", "ExtraLight"];
// if you join all the bits, each item of your array can be represented with a 6
// bits number:
// ( 0 => 000000 => "Expanded Black" ... 40 => 101000 => "Condensed ExtraLight" )

$crit2 = array_flip($crit2);

$result = [];

foreach ($arr as $item) {
    if (false !== strpos($item, "Expanded"))
        $key = 0;  // 000000
    elseif (false !== strpos($item, "Condensed"))
        $key = 32; // 100000
    else
        $key = 16; // 010000

    $parts = explode(' ', $item);
    $weight = isset($parts[1]) ? $parts[1] : $parts[0];
    $key += $crit2[$weight];

    $result[$key] = $item;
}

ksort($result, SORT_NUMERIC);
$result = array_values($result);

print_r($result);

demo