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@ 2019-05-21T08:38:54Z

<?php
$arr = 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'
                )

        )
);
$res['MergedUser'] = [];
array_map(function($v) use (&$res){
   foreach($v as $value){
        if(!array_key_exists($value['ID'], $res['MergedUser']))
            $res['MergedUser'][$value['ID']] = $value;
   }
}, $arr);

print_r(array_values($res['MergedUser']));

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

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