- unserialize: documentation ( source)
- json_encode: documentation ( source)
<?php
$a = 'a:3:{s:5:"email";s:31:"jirka.netsuite+kvedla@gmail.com";s:10:"inviter_id";s:3:"189";s:5:"roles";a:2:{i:1;s:8:"Everyone";i:6;s:7:"Jezevec";}}';
$b = 'a:2:{s:5:"email";s:31:"jirka.netsuite+kvedla@gmail.com";s:5:"roles";a:2:{i:1;s:8:"Everyone";i:6;s:7:"Jezevec";}}';
echo json_encode(unserialize($b));