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@ 2021-01-15T17:47:15Z

<?php

function array_remove_null($input) { 
  foreach ($input as &$value) { 
    if (is_array($value)) { 
      $value = array_remove_null($value); 
    }
  }
  return array_filter($input, function($item){
    return $item !== null && $item !== '';
  }); 
}

/**
 * Using https://www.php.net/manual/en/function.array-replace-recursive.php
 */

$array1 = [
	"2020-12" => [
		"Mois" => "2020-12",
		"Nbr vendus" => null,
		"CA TTC" => null,
		"number" => "1",
	],
	"2021-01" => [
		"Mois" => "2021-01",
		"Nbr vendus" => null,
		"CA TTC" => null,
		"number" => "2",
	],
];

$array2 = [
	"2020-12" => [
		"Mois" => "2020-12",
		"Nbr vendus" => "1",
		"CA TTC" => "790",
		"number" => null,
	],
	"2021-01" => [
		"Mois" => "2021-01",
		"Nbr vendus" => "3",
		"CA TTC" => "1680",
		"number" => null,
	],
];

$array = array_replace_recursive(array_remove_null($array1), array_remove_null($array2));

var_dump($array);

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { ["2020-12"]=> array(4) { ["Mois"]=> string(7) "2020-12" ["number"]=> string(1) "1" ["Nbr vendus"]=> string(1) "1" ["CA TTC"]=> string(3) "790" } ["2021-01"]=> array(4) { ["Mois"]=> string(7) "2021-01" ["number"]=> string(1) "2" ["Nbr vendus"]=> string(1) "3" ["CA TTC"]=> string(4) "1680" } }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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