unserialize() function is used to serialized string into its original form.
<?php
$serializedData = 'a:3:{s:4:"name";s:4:"John";s:3:"age";i:30;s:4:"city";s:8:"New York";}';
$data = unserialize($serializedData);
print_r($data);
?>Output:
Array( [name] => John [age] => 30 [city] => New York)