- var_dump: documentation ( source)
- json_encode: documentation ( source)
<?php
$arr1 = ["a","b","c"];
var_dump(json_encode($arr1));
$arr2 = [1=>"A", 4=>"b", 10=>"c"];
var_dump(json_encode($arr2));
$arr3 = [1=>"A", 14=>"b", 10=>"c"];
var_dump(json_encode($arr2));