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@ 2018-06-27T02:39:31Z

<?php

$json = '{
  "credit_card": {
    "cvc": "123",
    "expiry": {
      "month": "12",
      "year": "2019"
    },
    "name": "Julian",
    "number": "5123450000000008",
    "token": null
  },
  "amount": "10",
  "currency": "AUD",
  "gateway": {
    "line_of_business": "eWallet",
    "service": "default",
    "username": null
  },
  "external_id": "my external id",
  "reference": "julian test",
  "remitter_name": null,
  "request_id": "1529561070",
  "statement_description": null,
  "security_id": null
}';

$array = json_decode($json, true);


function array_filter_recursive($array)
{
    $array = array_filter($array);
    
    foreach ($array as $key => $value) {
        if (!is_array($value)) {
            continue;
        }
        
        array_filter_recursive($value);
    }
    
    return $array;
}


var_dump(array_filter_recursive($array));

Output for git.master, git.master_jit, rfc.property-hooks: array(7) { ["credit_card"]=> array(5) { ["cvc"]=> string(3) "123" ["expiry"]=> array(2) { ["month"]=> string(2) "12" ["year"]=> string(4) "2019" } ["name"]=> string(6) "Julian" ["number"]=> string(16) "5123450000000008" ["token"]=> NULL } ["amount"]=> string(2) "10" ["currency"]=> string(3) "AUD" ["gateway"]=> array(3) { ["line_of_business"]=> string(7) "eWallet" ["service"]=> string(7) "default" ["username"]=> NULL } ["external_id"]=> string(14) "my external id" ["reference"]=> string(11) "julian test" ["request_id"]=> string(10) "1529561070" }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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