這是什麼資料格式？解決思路

這是什麼資料格式？
a:24:{s:8:"duration";i:900;s:8:"redoable";s:2:"20";s:8:"onebyone";s:1:"0";s:7:"answers";s:1:"1";s:13:"given_answers";s:1:"1";s:17:"shuffle_questions";s:1:"1";s:15:"shuffle_answers";s:1:"1";s:17:"general_threshold";i:50;s:12:"master_score";i:50;s:11:"random_pool";i:0;s:17:"user_configurable";i:0;s:16:"maintain_history";s:1:"5";s:12:"display_list";s:1:"0";s:10:"pause_test";s:1:"1";s:15:"display_weights";s:1:"1";s:12:"only_forward";s:1:"0";s:10:"answer_all";s:1:"0";s:10:"redo_wrong";i:0;s:8:"redirect";s:1:"0";s:13:"assign_to_new";N;s:20:"automatic_assignment";N;s:20:"show_answers_if_pass";s:1:"1";s:15:"show_incomplete";i:0;s:13:"test_password";i:0;} 資料格式

------解決方案--------------------
序列化之後的格式，可用unserialize() 還原。
------解決方案--------------------
php 序列化資料

$s = <<< TXT
a:24:{s:8:"duration";i:900;s:8:"redoable";s:2:"20";s:8:"onebyone";s:1:"0";s:7:"answers";s:1:"1";s:13:"given_answers";s:1:"1";s:17:"shuffle_questions";s:1:"1";s:15:"shuffle_answers";s:1:"1";s:17:"general_threshold";i:50;s:12:"master_score";i:50;s:11:"random_pool";i:0;s:17:"user_configurable";i:0;s:16:"maintain_history";s:1:"5";s:12:"display_list";s:1:"0";s:10:"pause_test";s:1:"1";s:15:"display_weights";s:1:"1";s:12:"only_forward";s:1:"0";s:10:"answer_all";s:1:"0";s:10:"redo_wrong";i:0;s:8:"redirect";s:1:"0";s:13:"assign_to_new";N;s:20:"automatic_assignment";N;s:20:"show_answers_if_pass";s:1:"1";s:15:"show_incomplete";i:0;s:13:"test_password";i:0;}
TXT;

print_r(unserialize($s));

Array
(
[duration] => 900
[redoable] => 20
[onebyone] => 0
[answers] => 1
[given_answers] => 1
[shuffle_questions] => 1
[shuffle_answers] => 1
[general_threshold] => 50
[master_score] => 50
[random_pool] => 0
[user_configurable] => 0
[maintain_history] => 5
[display_list] => 0
[pause_test] => 1
[display_weights] => 1
[only_forward] => 0
[answer_all] => 0
[redo_wrong] => 0
[redirect] => 0
[assign_to_new] =>
[automatic_assignment] =>
[show_answers_if_pass] => 1
[show_incomplete] => 0
[test_password] => 0
)

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