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@ 2013-03-28T04:20:18Z

<?php
$A = array(
        'Z'=>array('d'=>array(
                                'v1'=>10,
                                'v2'=>20,
                                'v3'=>30

                                )
                   ),
        'A'=>array('a'=>array(
                                'v1'=>1,
                                'v2'=>2,
                                'v3'=>3

                                ),
                  'b'=>array(
                                'v1'=>1,
                                'v2'=>2,
                                'v3'=>3                                
                                )
                   ),
        'B'=>array('a'=>array(
                                'v1'=>1,
                                'v2'=>2,
                                'v3'=>3

                                ),
                     'b'=>array(
                                'v1'=>1,
                                'v2'=>2,
                                'v3'=>3                                
                                )
                   ),
        'C'=>array('a'=>array(
                                'v1'=>9,
                                'v2'=>8,
                                'v3'=>7

                                ),
                     'b'=>array(
                                'v1'=>6,
                                'v2'=>5,
                                'v3'=>4                                
                                )
                   )
        );
$total=array_reduce($A,function(&$r,$v){
	array_walk($v,function($val,$key)use(&$r){
		if(!isset($r[$key])) $r[$key]=array();
		array_walk($val,function($vv,$vk)use(&$r,$key){
			if(!isset($r[$key][$vk])) $r[$key][$vk]=0;
			$r[$key][$vk]+=$vv;
		});
	});
	return $r;
},array());
print_r($total);

Output for git.master, git.master_jit, rfc.property-hooks: Warning: {closure}(): Argument #1 ($r) must be passed by reference, value given in /in/8vZp4 on line 47 Warning: {closure}(): Argument #1 ($r) must be passed by reference, value given in /in/8vZp4 on line 47 Warning: {closure}(): Argument #1 ($r) must be passed by reference, value given in /in/8vZp4 on line 47 Warning: {closure}(): Argument #1 ($r) must be passed by reference, value given in /in/8vZp4 on line 47 Array ( [d] => Array ( [v1] => 10 [v2] => 20 [v3] => 30 ) [a] => Array ( [v1] => 11 [v2] => 12 [v3] => 13 ) [b] => Array ( [v1] => 8 [v2] => 9 [v3] => 10 ) )

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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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