php - 修改 php natcasesort 所以 'letters only' 先来

Question

我有一个数组

$arr=array(
"Mega XYZ no number",
"Classic no Number",
"Doppel 80x200cm",
"Classic 100x200cm",
"Mega 240x250",
"Classic 85x200cm",
"Mega 40x250",
"Profi 60x235cm",
"Mega 140x250",
);

并希望有以下顺序:

Classic no Number   
Classic 85x200cm  
Classic 100x200cm    
Doppel 80x200cm  
Mega XYZ no number  
Mega 40x250  
Mega 140x250  
Mega 240x250    
Profi 60x235cm 

php 的函数 natcasesort() 几乎可以正确完成它，除了 'Classic no Number' 和 'Mega XYZ no number' 不会成为他们“小组”中的第一名!我希望其中没有任何数字的项目显示在它们按字母顺序排列的带数字的组项目之前。

Answer 1

就是这样:

function cmp($a, $b) {
    if ($a == $b) {
        return 0;
    }
    $arr1 = str_split($a);
    $arr2 = str_split($b);

    $number1 = "";
    $number2 = "";

    for($i = 0; $i < count($arr1); $i++){
        $char1 = $arr1[$i];
        $char2 = $arr2[$i];
        if(is_numeric($char1) && !is_numeric($char2)){
            return 1;
        }
        if(!is_numeric($char1) && is_numeric($char2)){
            return -1;
        }
        else if(is_numeric($char1) && is_numeric($char2)){
            $number1 .= $char1;
            $number2 .= $char2;
        }
        else {
            if($char1 != $char2){
                if(!empty($number1) && !empty($number2)){
                    $number1 = intval($number1);
                    $number2 = intval($number2);
                    return ($number1 < $number2) ? -1 : 1;
                }
                return ($char1 < $char2) ? -1 : 1;
            }
            else {
                if(!empty($number1) && !empty($number2) && $number1 != $number2){
                    $number1 = intval($number1);
                    $number2 = intval($number2);
                    return ($number1 < $number2) ? -1 : 1;
                }
            }
        }
    }
}

usort($arr, "cmp");