how to push values in multidimensional array in php

Question

$classType array i am storing the class wise type like class 1 having type A & class 2 having type is A & class 3 having type is B

$clollege['studentDetails'] array i want to push type from $classType array based on class what is the type

$clollege['studentDetails'] grade and $classType class both are same.

Expected Output

Array
(
    [0] => Array
        (
            [grade] => 2
            [hobbies] => Array
                (
                    [0] => A
                    [1] => B
                )
        [type] => A

        )

    [1] => Array
        (
            [grade] => 2
            [hobbies] => Array
                (
                    [0] => A
                )
           [type] => A

        )

    [2] => Array
        (
            [grade] => 3
            [hobbies] => Array
                (
                    [0] => C
                )
        [type] => A

        )

I have tried but not working my expected answer,kindly anyone updaye my answer, i have posted my code in below section. i know this is simple question , if anyone post your so that i can learn from here How to push

My Code

<?php
$classType = [
    ["class" => "1", "type" => "A"],
    ["class" => "2", "type" => "A"],
    ["class" => "3", "type" => "B"]
];

$clollege['studentDetails'] = [
   ["grade" => "2", "hobbies" => ["A" , "B"] ],
   ["grade" => "2", "hobbies" => ["A" ] ],
   ["grade" => "3", "hobbies" => [ "C" ] ]
];

foreach ($classType as $item) {
        $clollege['studentDetails'][$item['class']]['type'] = $item['type'];
}

echo "<pre>";
print_r($clollege['studentDetails']);exit;
?>

Update code section

$studentList['studentDetails'] = [
    [ "group" => ["id" => 1 , "grade" => "2"] ],
    [ "group" => ["id" => 2 , "grade" => "2", ] ],
    [ "group" => [ "id" => 3, "grade" => "3"] ]
];

Answer 1

You can try the following way with the help of array_walk() .

$classType = [
    ["class" => "1", "type" => "A"],
    ["class" => "2", "type" => "A"],
    ["class" => "3", "type" => "B"]
];

$clollege['studentDetails'] = [
    ["grade" => "2", "hobbies" => ["A" , "B"] ],
    ["grade" => "2", "hobbies" => ["A" ] ],
    ["grade" => "3", "hobbies" => [ "C" ] ]
];

$classType = array_column($classType, 'type', "class");
array_walk($clollege['studentDetails'], function(&$item) use($classType) {
    $item['type'] = $classType[$item['grade']];
});

echo '<pre>';
print_r($clollege['studentDetails']);
echo '</pre>';

Working demo .

Answer 2

You can not use grade as key 2 times in a single or sub array element, i have mentioned solution by using type index.

You can use foreach with array_reduce

 foreach($clollege['studentDetails'] as $key => &$val){
    $grade       = $val['grade'];
    $val['type'] = array_reduce($classType, function($r, $item) use ($grade){
      return ($item['class'] == $grade) ? $item['type'] : $r;
    }); 
  }
  print_r($clollege);

Updates

Change code

$grade = $val['grade'];

to

$grade = $val['group']['grade'];

If there is chance for the both of the situation use

$grade  = isset($val['group']['grade']) ? $val['group']['grade'] : $val['grade'];

Working DEMO : https://3v4l.org/5HGLk