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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 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: 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 } }
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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