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@ 2019-05-20T11:06:38Z

<?php

$arr = 
Array
(
    '0' => Array
        (
            'emp_firstname' => 'Alistair',
            'non_pm' => 'AMZ',
            'sum' => 2
        ),


    '1' => Array
        (
            'emp_firstname' => 'Shakkeer',
            'non_pm' => 'SHK',
            'sum' => 3
        ),

    '2' => Array
        (
            'emp_firstname' => 'Waqas',
            'non_pm' => 'WAS',
            'sum' => 12
        ),

    '3' => Array
        (
            'emp_firstname' => 'Zain',
            'non_pm' => 'ZAI',
            'sum' => 9
        ),


    '4' => Array
        (
            'emp_firstname' => 'Shakkeer',
            'gud_pmeditor' => 'SHK',
            'sum' => 4
        ),

    '5' => Array
        (
            'emp_firstname' => 'Zain',
            'gud_pmeditor' => 'ZAI',
            'sum' => 2
        )

);
$res=[];
foreach($arr as $val){
    if(array_key_exists($val['emp_firstname'], $res))
        $res[$val['emp_firstname']]['sum'] = ($res[$val['emp_firstname']]['sum'] + $val['sum']);
    else
        $res[$val['emp_firstname']] = $val;
}
print_r(array_values($res));

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [emp_firstname] => Alistair [non_pm] => AMZ [sum] => 2 ) [1] => Array ( [emp_firstname] => Shakkeer [non_pm] => SHK [sum] => 7 ) [2] => Array ( [emp_firstname] => Waqas [non_pm] => WAS [sum] => 12 ) [3] => Array ( [emp_firstname] => Zain [non_pm] => ZAI [sum] => 11 ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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