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@ 2020-02-03T07:32:42Z

<?php

$graphData =
    array(
        'DataArr' => 
        array
            (
            array(
             'data' => array
                 (
                   array 
                      ( 
                        'Month' => '10 Jan 2019',
                        'Cost' => 60.3,
                        'Name' => 'Savings'
                      ),
                   array 
                      ( 
                        'Month' => '10 Feb 2019',
                        'Cost' => 45.3,
                        'Name' => 'Savings'
                      ),
                   array 
                      ( 
                        'Month' => '10 Mar 2019',
                        'Cost' => 50.6,
                        'Name' => 'Savings'
                      )
                )
            ),
            array
            (
             'data' => array
                 (
                   array 
                      ( 
                        'Month' => '10 Jan 2019',
                        'Cost' => 89.62,
                        'Name' => 'Discount'
                      ),
                   array 
                      ( 
                        'Month' => '10 Feb 2019',
                        'Cost' => 20.2,
                        'Name' => 'Discount'
                      ),
                   array 
                      ( 
                        'Month' => '10 Mar 2019',
                        'Cost' => 0.0,
                        'Name' => 'Discount'
                    )
                )
           )
    )
);


$result = [];

foreach($graphData['DataArr'] as $value){
    foreach($value['data'] as $details){
        if(!isset($result['data'][$details['Month']])) $result['data'][$details['Month']]  = ['Month' => $details['Month']];
        $result['data'][$details['Month']][$details['Name']] = $details['Cost'];
    }
}

$result['data'] = array_values($result['data']);
print_r($result);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [data] => Array ( [0] => Array ( [Month] => 10 Jan 2019 [Savings] => 60.3 [Discount] => 89.62 ) [1] => Array ( [Month] => 10 Feb 2019 [Savings] => 45.3 [Discount] => 20.2 ) [2] => Array ( [Month] => 10 Mar 2019 [Savings] => 50.6 [Discount] => 0 ) ) )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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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