通過正則表達式組在PHP

Question

排序我有這種形式的文件名的數組：

「A - 1.2 - 地板Plan.PDF」

我需要陣列通過在開始第一類排序，按以下順序：

1. Category: A 
2. Category: ESC 
3. Category: C 
4. Category: M 
5. Category: E 
6. Category: P 

然後，我需要按類別後的數字排序數組。

這裏是要排序的數組的一個例子：

$arr[0] = "A - 1.0 - Title Page.PDF"; 
$arr[1] = "A - 2.2 - Enlarged Floor Plans"; 
$arr[2] = "A - 2.1.0 - Structural Details.PDF"; 
$arr[3] = "E - 1.0 - Electrical Title Page.PDF"; 
$arr[4] = "A - 1.2 - Floor Plan.PDF"; 
$arr[5] = "P - 1.0 - Plumbing Title Page.PDF"; 
$arr[6] = "A - 2.1.1 - Structural Details.PDF"; 
$arr[7] = "C - 1.0 - Civil Title Page.PDF"; 
$arr[8] = "M - 1.0 - Mechanical Title Page.PDF"; 
$arr[9] = "ESC - 1.0 - Erosion Control Plan.PDF"; 

理想的情況下，這個數組將隨即成爲

$arr[0] = "A - 1.0 - Title Page.PDF"; 
$arr[1] = "A - 1.2 - Floor Plan.PDF"; 
$arr[2] = "A - 2.1.0 - Structural Details.PDF"; 
$arr[3] = "A - 2.1.1 - Structural Details.PDF"; 
$arr[4] = "A - 2.2 - Enlarged Floor Plans"; 
$arr[5] = "ESC - 1.0 - Erosion Control Plan.PDF"; 
$arr[6] = "C - 1.0 - Civil Title Page.PDF"; 
$arr[7] = "M - 1.0 - Mechanical Title Page.PDF"; 
$arr[8] = "E - 1.0 - Electrical Title Page.PDF"; 
$arr[9] = "P - 1.0 - Plumbing Title Page.PDF"; 

我有一個適當的分組中的文件名下面的正則表達式：

^([A-Z]+?) ?- ?([0-9]+)\.([0-9]+)(\.([0-9]+))?.*$ 

我想按組1排序的數組，然後按組2，然後按組3 。如果第5組存在，則最後按組5排序。忽略組4.

按字典順序排列類別可能更容易。如果是這樣，那就沒事了;但如果按照上述順序排序，則更爲可取。

有沒有辦法用PHP來做到這一點？

Answer 1

有一種以比較方法作爲參數的排序函數。您可以使用它，例如像這樣：

$order = array('A', 'ESC', 'C', 'M', 'E', 'P'); // order of categories 
$order = array_flip($order); // flip order array, it'll look like: ('A'=>0, 'ESC'=>1, ...) 

function cmp($a, $b) 
{ 
    global $order; 

    $ma = array(); 
    $mb = array(); 
    preg_match('/^([A-Z]+?) ?- ?([0-9]+)\.([0-9]+)(?:\.([0-9]+))?.*$/', $a, $ma); 
    preg_match('/^([A-Z]+?) ?- ?([0-9]+)\.([0-9]+)(?:\.([0-9]+))?.*$/', $b, $mb); 

    if ($ma[1] != $mb[1]) { 
     return ($order[$ma[1]] < $order[$mb[1]]) ? -1 : 1; 
    } 
    if ($ma[2] != $mb[2]) { 
     return $ma[2] < $mb[2] ? -1 : 1; 
    } 
    if ($ma[3] != $mb[3]) { 
     return $ma[3] < $mb[3] ? -1 : 1; 
    } 
    // I've changed a regex a little bit, so the last number is 4th group now 
    if (@$ma[4] != @$mb[4]) { 
     return @$ma[4] < @$mb[4] ? -1 : 1; 
    } 
    return 0; 
} 
usort($arr, "cmp"); 

Answer 2

如何：

$arr[0] = "A - 1.0 - Title Page.PDF"; 
$arr[1] = "A - 2.2 - Enlarged Floor Plans"; 
$arr[2] = "A - 2.1.0 - Structural Details.PDF"; 
$arr[3] = "E - 1.0 - Electrical Title Page.PDF"; 
$arr[4] = "A - 1.2 - Floor Plan.PDF"; 
$arr[5] = "P - 1.0 - Plumbing Title Page.PDF"; 
$arr[6] = "A - 2.1.1 - Structural Details.PDF"; 
$arr[7] = "C - 1.0 - Civil Title Page.PDF"; 
$arr[8] = "M - 1.0 - Mechanical Title Page.PDF"; 
$arr[9] = "ESC - 1.0 - Erosion Control Plan.PDF"; 


function cmp($a,$b) { 
    $arr_a = split(' - ', $a); 
    $arr_b = split(' - ', $b); 
    if ($arr_a[0] == $arr_b[0]) 
     return strcmp($arr_a[1], $arr_b[1]); 
    return strcmp($arr_a[0], $arr_b[0]); 
} 

usort($arr, "cmp"); 
print_r($arr); 

輸出：

Array 
(
    [0] => A - 1.0 - Title Page.PDF 
    [1] => A - 1.2 - Floor Plan.PDF 
    [2] => A - 2.1.0 - Structural Details.PDF 
    [3] => A - 2.1.1 - Structural Details.PDF 
    [4] => A - 2.2 - Enlarged Floor Plans 
    [5] => C - 1.0 - Civil Title Page.PDF 
    [6] => E - 1.0 - Electrical Title Page.PDF 
    [7] => ESC - 1.0 - Erosion Control Plan.PDF 
    [8] => M - 1.0 - Mechanical Title Page.PDF 
    [9] => P - 1.0 - Plumbing Title Page.PDF 
)