- var_dump: documentation ( source)
- array_values: documentation ( source)
- json_encode: documentation ( source)
<?php
$array = ['1','2','3'];
var_dump($array, json_encode($array));
unset($array[1]);
$array_new = array_values($array);
var_dump($array, json_encode($array));
var_dump($array_new, json_encode($array_new));