PHP使用正确数字的字符串

Question

我想通过它的一个元素来使用对象，但我不知道如何对包含数字的字符串进行字符串比较，并且数字的位置并不总是相同。

例如在我的情况的值，我想排序是这样的： String (A), String (B), String bit longer 1, String bit longer 2, String bit longer 3, String bit longer 10, String bit longer 20（但不是按照这个顺序）

，如果我做一个简单的strcmp（）比较usort将对其进行排序，如MySQL会这样顺序看起来是这样的：String (A), String (B), String bit longer 1, String bit longer 10, String bit longer 2, String bit longer 20, String bit longer 3这是错误的

现在我卡住了，不应该怎么做才能正确分类。

编辑：

对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

对于排序字符串数组，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 
) 

对于财产使用natsort,strnatcmp所使用的比较函数，在您传递给的自定义比较函数中：

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) 
)