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run code in 300+ PHP versions simultaneously

@ 2017-12-08T09:23:04Z

<?php

$obj = json_decode('{
    "Group1": {
        "Blue": {
            "Round": [
                "Harold",
                "Arthur",
                "Tom"
            ]
        },
        "Green": {
            "Round": [
                "Harold"
            ],
            "Circle": [
                "Todd",
                "Mike"
            ]
        }
    },
    "Group2": {
        "Blue": {
            "Round": [
                "Peter"
            ]
        }
    }
}', true);

function traverse_array($array,$key="",$prev="",&$final_op=array())
{
  if(is_array($array))
  {
    $prev .= $key." - ";
    foreach ($array as $key => $value) {
      traverse_array($value,$key,$prev,$final_op);
    }
  }
  else
  {
    
    $prev =trim($prev," - ");    
    $final_op[$prev][]=$array;
  }
  return $final_op;
}
$data = traverse_array($obj);
foreach ($data as $key => $value) {
  echo $key." (".implode(",", $value).")";
  echo PHP_EOL;
}

Output for git.master, git.master_jit, rfc.property-hooks: Group1 - Blue - Round (Harold,Arthur,Tom) Group1 - Green - Round (Harold) Group1 - Green - Circle (Todd,Mike) Group2 - Blue - Round (Peter)

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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