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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);

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

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