- var_dump: documentation ( source)
- json_encode: documentation ( source)
<?php
$arr = array(
2378107417=>"8",
2909966995=>"6",
3511241473=>"5",
1884062190=>"5",
5188467195=>"4",
5459260341=>"3",
);
$str = json_encode($arr,JSON_UNESCAPED_UNICODE);
var_dump($str);