fart.php

<?php

$item = json_decode('{"key": "value"}');
print_r($item);

$other_item = json_decode('{"key": "value"');
print_r($other_item);
echo is_null($other_item);

$things = ["one": 1, "two": 2];
print_r($things);

$old_three = $things["three"];
$things["three"] = "fart";
print_r($things);
$things["three"] = $old_three;
print_r($things);