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@ 2019-07-25T13:11:00Z

<?php

$array =  array(

	array('FIRSTID' =>58,
			'SECONDID' =>12,
			'TYPE' =>319,
			'AMOUNT' =>300

		),	
	array('FIRSTID' =>58,
			'SECONDID' =>12,
			'TYPE' =>319,
			'AMOUNT' =>600

		),

		array('FIRSTID' =>59,
			'SECONDID' =>14,
			'TYPE' =>321,
			'AMOUNT' =>900

		),
			array('FIRSTID' =>59,
			'SECONDID' =>14,
			'TYPE' =>321,
			'AMOUNT' =>500

		),
		array('FIRSTID' =>60,
			'SECONDID' =>13,
			'TYPE' =>320,
			'AMOUNT' =>1000

		),
			array('FIRSTID' =>60,
			'SECONDID' =>13,
			'TYPE' =>321,
			'AMOUNT' =>1500
		),
);

$groups = array();
    foreach ($array as $item) {
        $key = $item['FIRSTID'].''.$item['SECONDID'].''.$item['TYPE'];
        if (!array_key_exists($key, $groups)) 
        {
            $groups[$key] = array(
                'FIRSTID' => $item['FIRSTID'],
                'SECONDID' => $item['SECONDID'],
                'TYPE' => $item['TYPE'],
                'AMOUNT' => $item['AMOUNT'],
            );
        } 
        else {
          
            $groups[$key]['AMOUNT'] = $groups[$key]['AMOUNT'] + $item['AMOUNT'];
        }
    }

echo '<pre>';
print_r($groups);
echo '</pre>';

Output for git.master, git.master_jit, rfc.property-hooks: <pre>Array ( [5812319] => Array ( [FIRSTID] => 58 [SECONDID] => 12 [TYPE] => 319 [AMOUNT] => 900 ) [5914321] => Array ( [FIRSTID] => 59 [SECONDID] => 14 [TYPE] => 321 [AMOUNT] => 1400 ) [6013320] => Array ( [FIRSTID] => 60 [SECONDID] => 13 [TYPE] => 320 [AMOUNT] => 1000 ) [6013321] => Array ( [FIRSTID] => 60 [SECONDID] => 13 [TYPE] => 321 [AMOUNT] => 1500 ) ) </pre>

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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