如何找到PHP代码算法[重复]

This question already has an answer here:

I have a php site url and it's encode by base64 and I'm decode it now a part of code this is:

a:5:{s:4:"date";s:10:"2017-01-26";s:4:"from";s:5:"10003";s:2:"to";s:5:"10006";s:3:"sec";i:1484761070;s:6:"seckey";i:13910;}

now I don't know what is this code algorithm I think i's not json. can you help me?

</div>

Looks like it has just been serialized.

$str = 'a:5:{s:4:"date";s:10:"2017-01-26";s:4:"from";s:5:"10003";s:2:"to";s:5:"10006";s:3:"sec";i:1484761070;s:6:"seckey";i:13910;}';
var_dump(unserialize($str));

Output:

array(5) {
  ["date"]=>
  string(10) "2017-01-26"
  ["from"]=>
  string(5) "10003"
  ["to"]=>
  string(5) "10006"
  ["sec"]=>
  int(1484761070)
  ["seckey"]=>
  int(13910)
}