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@ 2019-10-22T15:31:15Z

<?php
$a = array (
    0 => 
    array (
      'total_price' => '19.120000',
      'total_percent' => '0.20',
      'vat_code' => 22,
      'discount_percent' => '3.82',
    ),
    1 => 
    array (
      'total_price' => '58.000000',
      'total_percent' => '0.60',
      'vat_code' => 22,
      'discount_percent' => '11.60',
    ),
    2 => 
    array (
      'total_price' => '20.000000',
      'total_percent' => '0.21',
      'vat_code' => 4,
      'discount_percent' => '4.00',
    ),
  );
foreach($a as $v){
	isset($group[$v['vat_code']]) ?
	($group[$v['vat_code']]['total_price'] += $v['total_price'] AND 
		$group[$v['vat_code']]['total_percent'] += $v['total_percent'] AND
		$group[$v['vat_code']]['discount_percent'] += $v['discount_percent']
	)
	:
	($group[$v['vat_code']] = $v);
}
print_r(array_values($group));

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [total_price] => 77.12 [total_percent] => 0.8 [vat_code] => 22 [discount_percent] => 15.42 ) [1] => Array ( [total_price] => 20.000000 [total_percent] => 0.21 [vat_code] => 4 [discount_percent] => 4.00 ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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