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@ 2019-07-02T10:18:21Z

<?php

$left =    Array
    (
        0 => Array
		(
			'UserID' => 6835406
		),

        1 => Array
		(
			'UserID' => 8418097
		),
		 2 => Array
		(
			'UserID' => 9889987
		),
	    3 => Array
		(
			'UserID' => 9899999
		)

    );

$right =  Array
	(
		0 => Array
		(
			'Amount' => 0.00,
			'UserID' => 6835406
		),

		1 => Array
		(
			'Amount' => 0.00,
			'UserID' => 8418097
		),
		2 => Array
		(
			'UserID' => 9889987
		)

	);
	
function combineArray($left, $right){
    $finalArray = array();
    foreach($left as $lft){
        foreach($right as $rgt){
            if($lft['UserID']  == $rgt['UserID']){
               $finalArray[$lft['UserID']]['UserID'] = $lft['UserID'];
               $finalArray[$lft['UserID']]['Amount'] = (isset($rgt['Amount']) ? $rgt['Amount'] : NULL);
               break;
            }else{
                $finalArray[$lft['UserID']]['UserID'] = $lft['UserID'];
                $finalArray[$lft['UserID']]['Amount'] =  NULL;
            }
        }
    }
    return $finalArray = array_values($finalArray);
}

var_dump(combineArray($left, $right));

Output for git.master, git.master_jit, rfc.property-hooks: array(4) { [0]=> array(2) { ["UserID"]=> int(6835406) ["Amount"]=> float(0) } [1]=> array(2) { ["UserID"]=> int(8418097) ["Amount"]=> float(0) } [2]=> array(2) { ["UserID"]=> int(9889987) ["Amount"]=> NULL } [3]=> array(2) { ["UserID"]=> int(9899999) ["Amount"]=> NULL } }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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