PHP reference ,( returning specific array index for additional to be added on the fly), Php

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<?php //php 7.0.8
    
      function &getObj()
      {
             $params = [
                 'index' => 'baseball',
                 'body'  =>
                    ["query"=>
                        ["bool"=>
                            ["must"=>[
                                ["match"=>
                                    ["baseball_sports.league_id"=>"1066"]
                                ]
                            ],
                            "must_not"=>[],
                            "should"=>[]
                            ]
                        ],
                            "from"=>0,
                            "size"=>10,
                            "sort"=>[],
                    ]
                ];
          return  $params['body']['query']['bool']['must'];
      }

function query(&$func)
       {
           $ar = &$func;
           $ar[] =  ["match"=>
                                    ["baseball_sports.league_id"=>"1065"]
                    ];
         var_dump($func);
       }
   query(getObj());
    
?>

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PHP reference ,( returning specific array index for additional to be a...