Recuparare valore da una stringa

[satifal]

Prova un po' questo:

<?php
$str = 'a:6:{s:15:"info_buyRequest";a:6:{s:4:"uenc";s:104:"aHR0cDovL2trtrm11c2NsZW51dHrtrtfgflvbi5jb20vbWFyY2hlL2Fsci1pbmR1c3RyaWVzL2h1bWFwcm8tNDMwMy5odG1sP19fX1NJRD1V";s:7:"product";s:4:"7854";s:8:"form_key";s:16:"bMgl1tysqw876W8c";s:15:"related_product";s:0:"";s:15:"super_attribute";a:1:{i:548;s:3:"956";}s:3:"qty";s:1:"1";}s:15:"attributes_info";a:1:{i:0;a:2:{s:5:"label";s:5:"Gusto";s:5:"value";s:3:"Uva";}}s:11:"simple_name";s:19:"xxxxxx";s:10:"simple_sku";s:12:"54567532567";s:20:"product_calculations";i:1;s:13:"shipment_type";i:0;}';

$pattern = '/s:15:"attributes_info";a:1:{i:0;a:2:{s:5:"label";s:5:"Gusto";s:5:"value";s:[0-9]+:"(.+?)";}}/';
preg_match_all($pattern, $str, $matches);
print_r($matches);
?>