PHP sort array by key in 2 dimensional array

Question

In a Php i have an Array like this.

$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')
);

What i want to do is sorting by task_chapter_name but one more condition is there that if task_chapter_name value is same then next sorting should task_name wise.

Required Output

$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')
);

My Question is Marked as Duplicate but here i want to inform you that i have priorities sorting with the multidimensional array, My first priority was to sort by task_chapter_name now if i am getting same values in task_chapter_name then it should be sort with task_name.

@Pavlin , cant you see that i have multiple keys to sort with some priorities ? ? — Punit Gajjar, Aug 30 '16 at 17:50
My bad, use `array_multisort`, as brilliantly suggested by Linesofcode. — Pavlin, Aug 30 '16 at 17:56

score 2 · Accepted Answer · answered Aug 30 '16 at 17:29

2

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);

answered Aug 30 '16 at 17:29

Aaron

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its returning 1 :-( – Punit Gajjar Aug 30 '16 at 17:31
@PunitGajjar Check `$task_array` after running this code. – Aaron Aug 30 '16 at 17:32

AbraCadaver · Answer 2 · 2016-08-30T17:37:31.433

Extract the columns and sort on them in order, sorting the original array last. Obviously you can use SORT_ASC or SORT_DESC for the different arrays for different orders:

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

PHP >= 5.5.0 is needed for array_column() or use the PHP Implementation of array_column(). Or you can loop through and build arrays to use in the sort above:

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

PHP sort array by key in 2 dimensional array

2 Answers2