Filtering associative array based on two values

Question

I have an associative array that contains academic subjects data which is :

subjectName
year
semester

here is how it looks:

$subjects = array (
    0 => array (
        'subjectName' => 'Introduction to Programming', 
        'year' => '1',
        'semester' => '1', ),
    1 => array (
        'subjectName' => 'Introduction into Computer Science',
        'year' => '1',
        'semester' => '1', ),
    2 => array (
        'subjectName' => 'Computer Architecture',
        'year' => '1',
        'semester' => '2', ),
    3 => array (
        'subjectName' => 'Statistics',
        'year' => '2',
        'semester' => '1', ),
    4 => array (
        'subjectName' => 'DBMS',
        'year' => '2',
        'semester' => '1', ),
 );

I want to convert (modify) this array to a 3 dimension array based on the level ($subjects['level']) then the semester ($subjects['semester']).

Eventually i want it to look like this :

  $newArray = array(
    0 => array(
      0 => array(
        0 => array(
          'subjectName' => 'Introduction to Programming',
          'year' => '1',
          'semester' => '1'
        ),
        1 => array(
          'subjectName' => 'Introduction into Computer Science',
          'year' => '1',
          'semester' => '1'
        )
      ),
      1 => array(
        0 => array(
          'subjectName' => 'Computer Architecture',
          'year' => '1',
          'semester' => '2'
        )
      )
    ),
    1 => array(
      0 => array(
        0 => array(
          'subjectName' => 'DBMS',
          'year' => '2',
          'semester' => '1'
        )
      )
    )
  );

I've messed around with array_filter() but couldn't achieve anything.

I was able to filter it based on years using this code: for($y = 1 ; $y < $years_count ; $y ++) { $filtered[] = array_values(array_filter($subjects, function($v) use ($y) { return $v['level'] == "$y"; })); } — mohdule
– mohdule, Commented Oct 8, 2017 at 9:32
An image is worth one thousand words but not when it contains code. Use var_export() to dump the data and use copy & paste to put it in the question as text. — axiac
– axiac, Commented Oct 8, 2017 at 10:19
"I want to convert (filter) this array..." -- filtering and conversion are different things. array_filter() does not change the array structure, it just removes some items from the array. It is not the right tool for the job. — axiac
– axiac, Commented Oct 8, 2017 at 10:24
@axiac thanks for the information bro/sis, Yeah i think that code is more effective to post than images in this case , i was trying to make it simpler to understand (since i always find myself explaining stuff) , But most people who view this are programmers so code is the simplest form xD — mohdule
– mohdule, Commented Oct 8, 2017 at 11:54
If you post code or data in a form that can be easily copy/pasted and used (i.e. as text) you have big chances to get an useful answer. If you post an image that contains the code all you get are down votes. I just retracted mine ;-) — axiac
– axiac, Commented Oct 8, 2017 at 12:10

Ankur Garg · Accepted Answer · 2017-10-08 09:54:51Z

1

I am not sure about array_filter to get desired result. But you can use following trick.

$array = [
        ['name'=>'gg','year'=>'1','semster'=>1],
        ['name'=>'gg','year'=>'1','semster'=>2],
        ['name'=>'gg','year'=>'2','semster'=>1]
        ];
$newArray = [];

foreach($array as $arr){
 $newArray[$arr['year']][$arr['semster']][] = $arr;
}
print_r($newArray);

here is the running snippet: https://ideone.com/U2aX8r

answered Oct 8, 2017 at 9:54

Ankur Garg

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