PHP使用正確數字的字符串

Question

我想通過它的一個元素來使用對象，但我不知道如何對包含數字的字符串進行字符串比較，並且數字的位置並不總是相同。

例如在我的情況的值，我想排序是這樣的： String (A), String (B), String bit longer 1, String bit longer 2, String bit longer 3, String bit longer 10, String bit longer 20（但不是按照這個順序）

，如果我做一個簡單的strcmp（）比較usort將對其進行排序，如MySQL會這樣順序看起來是這樣的：String (A), String (B), String bit longer 1, String bit longer 10, String bit longer 2, String bit longer 20, String bit longer 3這是錯誤的

現在我卡住了，不應該怎麼做才能正確分類。

編輯：

對象我想排序如下所示：

Array 
(
    [0] => stdClass Object 
     ([field] => String (A) ... lots of other fields) 
    [1] => stdClass Object 
     ([field] => String (B) ... lots of other fields) 
    [2] => stdClass Object 
     ([field] => String bit longer 1 ... lots of other fields) 
    [3] => stdClass Object 
     ([field] => String bit longer 2 ... lots of other fields) 
    ...and so on 
) 

Answer 1

對於排序字符串數組，你可以使用natsort：

php > print_r($ary); 
Array 
(
    [0] => String (A) 
    [1] => String (B) 
    [2] => String bit longer 1 
    [3] => String bit longer 10 
    [4] => String bit longer 2 
    [5] => String bit longer 20 
    [6] => String bit longer 3 
) 
php > natsort($ary); 
php > print_r($ary); 
Array 
(
    [0] => String (A) 
    [1] => String (B) 
    [2] => String bit longer 1 
    [4] => String bit longer 2 
    [6] => String bit longer 3 
    [3] => String bit longer 10 
    [5] => String bit longer 20 
) 

對於財產使用natsort,strnatcmp所使用的比較函數，在您傳遞給的自定義比較函數中：

function natcmpfield($obj1, $obj2) { 
    return strnatcmp($obj1->fieldName, $obj2->fieldName); 
} 

usort($objArray, natcmpfield); 

例如：

php > print_r($objArray); 
Array 
(
    [0] => Example Object ([str] => String (A)) 
    [1] => Example Object ([str] => String (B)) 
    [2] => Example Object ([str] => String bit longer 1) 
    [3] => Example Object ([str] => String bit longer 10) 
    [4] => Example Object ([str] => String bit longer 2) 
    [5] => Example Object ([str] => String bit longer 20) 
    [6] => Example Object ([str] => String bit longer 3) 
) 
php > function natcmpfield($obj1, $obj2) { 
    { return strnatcmp($obj1->str, $obj2->str); 
    { } 
php > usort($objArray, natcmpfield); 
php > print_r($objArray); 
Array 
(
    [0] => Example Object ([str] => String (A)) 
    [1] => Example Object ([str] => String (B)) 
    [2] => Example Object ([str] => String bit longer 1) 
    [3] => Example Object ([str] => String bit longer 2) 
    [4] => Example Object ([str] => String bit longer 3) 
    [5] => Example Object ([str] => String bit longer 10) 
    [6] => Example Object ([str] => String bit longer 20) 
)