排序數組的有效方法？

Question

我variabel長度的數組，包含由開始日期排序的事件，看起來像這樣：

Array 
(
[0] => stdClass Object 
    (
     [id] => 1978 
     [date] => 2012-09-29 
    ) 

[1] => stdClass Object 
    (
     [id] => 1979 
     [date] => 2012-10-14 
    ) 

...etc.... 

我需要做一個函數，它的事件之一，並在一個新陣列的中部，把長度恰好爲7，並將事件的鄰居放在每一邊。

所以，如果事件5傳遞給函數，輸出應該是：

[2][3][4][5][6][7][8] 

如果第一個事件被傳遞給函數和事件的原始量爲12，輸出應該是：

[10][11][12][1][2][3][4] 

如果事件的一部開拓創新量是6，和第五事件被傳遞，則輸出應該是：

[2][3][4][5][6][1][] 

因此，事件列表應該總是在新數組中「環繞」並儘可能地填滿它。

我一起砍了一個解決方案，涉及很多步驟。我真的不喜歡它，它讓我想知道：

這將如何以最高效和優雅的方式完成？

Answer 1

You need to change the values in this codes 
    define('TO_SHOW',7); // number of items to show in your case it is 7 
    $selected  = 1; //// which one you need need at center. 

和你的數組;

執行此，並嘗試：

<?php 

define('TO_SHOW',7); // number of items to show in your case it is 7 

function change_order($arry, $sel){ 
    $arr_cnt  = count($arry); 
    $shift_count = $arr_cnt - (ceil(TO_SHOW/2)-$sel); 
    for($i=0; $i<$shift_count; $i++){ 
     array_push($arry, array_shift($arry)); 
    } 
    return array_slice($arry, 0, TO_SHOW); 
} 

$arr   = array(array(
        "id" => 1, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 2, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 3, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 4, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 5, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 6, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 7, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 8, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 9, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 10, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 11, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 12, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 13, 
        "date" => 2012-09-29 
        ), 
        array(
        "id" => 14, 
        "date" => 2012-09-29 
        ) 
       ); 

$selected  = 1; //// centre one    
$test = change_order($arr, $selected); 

echo "<pre>"; 
print_r($test); 
?>