How to implode array with key and value without foreach in PHP

How to implode array with key and value without foreach in PHP

$output = implode(', ', array_map(
    function ($v, $k) { return sprintf("%s='%s'", $k, $v); },
    $input,
    array_keys($input)
));


OR

<?php
  $a=array("item1"=>"object1", "item2"=>"object2");
  echo http_build_query($a,'',', ');
?>

output: item1=object1, item2=object2