这是什么数据格式？
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;}
数据格式
------解决方案--------------------
序列化之后的格式，可用unserialize() 还原。
------解决方案--------------------
php 序列化数据
$s = << 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
)