在二維數組中按鍵排序數組

Question

在一個PHP中我有一個這樣的數組。

$task_array = array(
    '0' => array('task_name' => 'tsk3','task_chapter_name' => 'chapter3'), 
    '1' => array('task_name' => 'tsk1','task_chapter_name' => 'chapter1'), 
    '2' => array('task_name' => 'tsk2','task_chapter_name' => 'chapter2'), 
    '3' => array('task_name' => 'tsk6','task_chapter_name' => 'chapter6'), 
    '4' => array('task_name' => 'tsk4','task_chapter_name' => 'chapter3'), 
    '5' => array('task_name' => 'tsk6','task_chapter_name' => 'chapter4'), 
    '6' => array('task_name' => 'tsk6','task_chapter_name' => 'chapter7') 
); 

我想要做的是task_chapter_name但一個條件排序是有，如果task_chapter_name值相同，則下一個排序應該task_name明智的。

所需的輸出

$task_array = array(
    '0' => array('task_name' => 'tsk1','task_chapter_name' => 'chapter1'), 
    '1' => array('task_name' => 'tsk2','task_chapter_name' => 'chapter2'), 
    '2' => array('task_name' => 'tsk3','task_chapter_name' => 'chapter3'), 
    '3' => array('task_name' => 'tsk4','task_chapter_name' => 'chapter3'), 
    '4' => array('task_name' => 'tsk6','task_chapter_name' => 'chapter4'), 
    '5' => array('task_name' => 'tsk6','task_chapter_name' => 'chapter6'), 
    '6' => array('task_name' => 'tsk6','task_chapter_name' => 'chapter7') 
); 

我的問題被標記爲複製，但在這裏，我想告訴你，我有優先與多維數組排序，我的首要任務是通過task_chapter_name現在如果我要進行排序在task_chapter_name獲得相同的值，那麼它應該排序task_name。

Answer 1

foreach ($task_array as $key => $row) { 
    $taskChapterName[$key] = $row['task_chapter_name']; 
    $taskName[$key] = $row['task_name']; 
} 
array_multisort($taskChapterName, SORT_ASC, $taskName, SORT_ASC, $task_array); 

Answer 2

提取的列和進行排序他們，最後排序最初的陣列。顯然，你可以使用不同的陣列SORT_ASC或SORT_DESC不同的訂單：

array_multisort(array_column($task_array, 'task_chapter_name'), 
       array_column($task_array, 'task_name'), 
       $task_array); 

PHP> = 5.5.0是需要array_column()或使用PHP Implementation of array_column()。或者你可以遍歷並建立陣列在上面的排序使用：

foreach($task_array as $val) { 
    $chap[] = $val['task_chapter_name']; 
    $task[] = $val['task_name']; 
}