我想对数组中的文件名进行排序，就像windows文件夹按名称排序一样

$arr =  array('php__01.png','php__02.png','php__03.png','php_2_01.png','php_2_02.png','php_10_01.png','php_10_02.png','php_9_02.png','php_9_01.png','php_9_03.png');

<?php
$arr =  array('php__01.png','php__02.png','php__03.png','php_2_01.png','php_2_02.png','php_10_01.png','php_10_02.png','php_9_02.png','php_9_01.png','php_9_03.png');
function cmp($a, $b) {
    $a_temp = str_replace('_', '', $a);
    $b_temp = str_replace('_', '', $b);     
    return strcmp($a_temp,$b_temp);
}
usort($arr, "cmp");
?>

array(10) {
[0]=>
string(11) "php__01.png"
[1]=>
string(11) "php__02.png"
[2]=>
string(11) "php__03.png"
[3]=>
string(13) "php_10_01.png"
[4]=>
string(13) "php_10_02.png"
[5]=>
string(12) "php_2_01.png"
[6]=>
string(12) "php_2_02.png"
[7]=>
string(12) "php_9_01.png"
[8]=>
string(12) "php_9_02.png"
[9]=>
string(12) "php_9_03.png"
}

array(10) {
[0]=>
string(10) "py__01.png"
[1]=>
string(10) "py__02.png"
[2]=>
string(10) "py__03.png"
[3]=>
string(11) "py_2_01.png"
[4]=>
string(11) "py_2_02.png"
[5]=>
string(11) "py_9_01.png"
[6]=>
string(11) "py_9_02.png"
[7]=>
string(11) "py_9_03.png"
[8]=>
string(12) "py_10_01.png"
[9]=>
string(12) "py_10_02.png"
}

解决方案如下:

<?php
$arr =  array('php__01.png','php__02.png','php__03.png','php_2_01.png','php_2_02.png','php_10_01.png','php_10_02.png','php_9_02.png','php_9_01.png','php_9_03.png');
function reduce($a) {
    $a = str_replace('_', '-', $a);
    $a = preg_replace('#([0-9]+)#e', 'sprintf("%02d", "''1")', $a);
    return $a;
}
function cmp($a, $b) {
    $a_temp = reduce($a);
    $b_temp = reduce($b);
    return strcmp($a_temp,$b_temp);
}
usort($arr, "cmp");
print_r($arr);
?>

http://ideone.com/Yt6jpQ

您需要将"_"替换为"-"，因为在排序数字时，"-"字符首先出现。

你还需要用前导零填充数字，这就是preg_match和sprintf的原因。

输出:

Array
(
    [0] => php__01.png
    [1] => php__02.png
    [2] => php__03.png
    [3] => php_2_01.png
    [4] => php_2_02.png
    [5] => php_9_01.png
    [6] => php_9_02.png
    [7] => php_9_03.png
    [8] => php_10_01.png
    [9] => php_10_02.png
)

您可以使用ussort;在本例中，按文件名的每个元素依次排序

$cb = function($valueA, $valueB) {
    $vA = explode('_', $valueA);
    $vB = explode('_', $valueB);
    $element = 0;
    do {
        $x = (int) $vA[$element] - (int) $vB[$element++];
    } while ($x == 0);
    return $x;
};
usort($arr, $cb);

这是一个更通用的方法，不会在"_"上分裂。

$arr =  array('php__01.png','php__02.png','php__03.png','php_2_01.png','php_2_02.png','php_10_01.png','php_10_02.png','php_9_02.png','php_9_01.png','php_9_03.png');
$wincmp = function ($a, $b) {
    $a = str_replace('_', '', $a);
    $b = str_replace('_', '', $b);
    $a_arr = preg_split("#([0-9]+)#", $a, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
    $b_arr = preg_split("#([0-9]+)#", $b, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
    
    $a_arr_len = count($a_arr);
    $b_arr_len = count($b_arr);
    
    $min_len = min($a_arr_len, $b_arr_len);
    
    for($i=0; $i<$min_len; $i++)
    {
        if (is_numeric($a_arr[$i]) && is_numeric($b_arr[$i]))
            $cmp = gmp_sign((int) $a_arr[$i] - (int) $b_arr[$i]);
        else
            $cmp = strcmp($a_arr[$i],$b_arr[$i]);
        if($cmp != 0)
            return $cmp;
    }
    
    if($a_arr_len < $b_arr_len)
        return -1;
    elseif($a_arr_len > $b_arr_len)
        return 1;
    
    return 0;
};
usort($arr, $wincmp);
print_r($arr);