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@ 2019-05-21T08:09:38Z

<?php

$array = Array
(
    'Nishanth' => Array
        (

            '0' => Array
                (
                    'ID' => 3,
                    'username' => 'IronMan'
                ),

            '1' => Array
                (
                    'ID' => 5,
                    'username' => 'SpiderMan'
                ),

            '2' => Array
                (
                    'ID' => 8,
                    'username' => 'AntMan'
                ),

            '3' => Array
                (
                    'ID' => 10,
                    'username' => 'BatMan'
                ),

            '4' => Array
                (
                    'ID' => 11,
                    'username' => 'SuperMan'
                ),

        ),


    'IronMan' => Array
        (
            '0' => Array
                (
                    'ID' => 1,
                    'username' => 'Nishanth'
                ),

            '2' => Array
                (
                    'ID' => 5,
                    'username' => 'SpiderMan'
                )

        ),

    'SpiderMan' => Array
        (
            '0' => Array
                (
                    'ID' => 1,
                    'username' => 'Nishanth'
                ),

            '1' => Array
                (
                    'ID' => 3,
                    'username' => 'IronMan'
                ),

            '2' => Array
                (
                    'ID' => 8,
                    'username' => 'AntMan'
                ),

            '3' => Array
                (
                    'ID' => 10,
                    'username' => 'BatMan'
                ),

            '4' => Array
                (
                    'ID' => 14,
                    'username' => 'Hulk'
                ),
        ),

    'AntMan' => Array
        (
            '0' => Array
                (
                    'ID' => 1,
                    'username' => 'Nishanth'
                ),

            '1' => Array
                (
                    'ID' => 10,
                    'username' => 'BatMan'
                )
        ),

    'BatMan' => Array
        (
            '0' => Array
                (
                    'ID' => 1,
                    'username' => 'Nishanth'
                ),

            '1' => Array
                (
                    'ID' => 5,
                    'username' => 'SpiderMan'
                ),

            '2' => Array
                (
                    'ID' => 8,
                    'username' => 'AntMan'
                ),

            '3' => Array
                (
                    'ID' => 11,
                    'username' => 'SuperMan'
                )
        ),

    'SuperMan' => Array
        (
            '0' => Array
                (
                    'ID' => 1,
                    'username' => 'Nishanth'
                ),

            '1' => Array
                (
                    'ID' => 10,
                    'username' => 'BatMan'
                )
        ),

    'Hulk' => Array
        (
            '0' => Array
                (
                    'ID' => 5,
                    'username' => 'SpiderMan'
                )

        )
);

$final_array = array();

foreach($array as $arr){
    
    foreach($arr as $a){
        $final_array[$a['ID']]['ID']= $a['ID'];
        $final_array[$a['ID']]['username']= $a['username'];
    }
}

$final_array = array_values($final_array);

print_r($final_array);

print_r: documentation ( source)
array_values: documentation ( source)

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