What Kind of String Is This? How to Unserialize This String

How to unserialize this kind of String in Dart?

I've made a translation to Dart of Nicolas Chambrier's javascript implementation to unserialize PHP strings.

Given a serialized string in php, translates and returns a Map<String, dynamic> object.

Here is a direct link to the class php_unserialize.dart, and you can also check how to use it here.

Usage:

String _sample = 'O:8:"stdClass":5:{s:4:"name";s:7:"Rodrigo";s:4:"last";s:7:"Cardozo";s:3:"age";i:35;s:9:"developer";b:1;s:6:"height";d:73.5;}';

var object = Php.unserialize(_sample);  

print(object["name"]);

What string format is this? How do I decode

This is a serialised array.
You can use the following to decode it and access it through PHP.

<?php
//Decode the string
$decode = unserialize('a:2:{i:0;i:141;i:1;i:462;}');    

//Decode will give you this
Array (
 [0] => 141
 [1] => 462
)

//Accessible by
echo $decode[0]; //will give you 141
echo $decode[0]; //will give you 462

?>

How to find out if a string is a serialized object/array or just a string?

Well, you can tell by looking at the format. When you serialize an array, you get a string that looks like a:1:{i:0;s:3:"foo"} And if you serialize an object, you get: o:7:"myclass":1:{s:3:"foo";s:3:"bar";}.

So if you want to test rudimentary, you can do these two regexes:

^a:\d+:{.*?}$

And

^o:\d+:"[a-z0-9_]+":\d+:{.*?}$

for arrays and objects respectively.

Note that this just checks for the generic form. To tell if it's a valid serialized string, you need to run it through unserialize() and test the return is_array($result) and is_object($result)...

Uable to unserialize a serialized string

This is because wrong serialize data is getting created from it.Even if we try to create JSON data, it is creating json data with wrong syntax.

If we will try bellow codes, PDO will not allow it.

$equipment['tables'] = isset( $_POST['equipment']['tables'] ) ? str_replace("'","", $_POST['equipment']['tables']) : '';
$equipment['tables'] = isset( $_POST['equipment']['tables'] ) ? addslashes($_POST['equipment']['tables']) : '';
$equipment['tables'] = isset( $_POST['equipment']['tables'] ) ? str_replace("'","\'", $_POST['equipment']['tables']) : '';

results server error 500 in this case.

and

$equipment['tables'] = isset( $_POST['equipment']['tables'] ) ? addcslashes($_POST['equipment']['tables']) : ''; will results in NULL.

We can can use either of 2 and 3 and change our PDO like this, that will solve the problem.

unserialize function is not returning returning string in same format

Your string is serialized twice,

s:33:"a:2:{i:0;s:2:"80";i:1;s:3:"112";}";

is a string (with 33 chars) encoded, so unserialize() this gives you another string which is

a:2:{i:0;s:2:"80";i:1;s:3:"112";}

you also need to unserialize() that...

$industries = 's:33:"a:2:{i:0;s:2:"80";i:1;s:3:"112";}";';
$industries = unserialize($industries);
print_r(unserialize($industries));

gives...

Array
(
    [0] => 80
    [1] => 112
)

PHP: Unserialize string

PHP documentation for unserialize

PHP code demo

<?php
$result=unserialize('a:3:{i:0;s:28:"Logo_final_SatuPintu (1).png";i:1;s:24:"Logo_final_SatuPintu.png";i:2;s:44:"WhatsApp Image 2017-03-24 at 7.04.01 PM.jpeg";}');
print_r($result);

Output:

Array
(
    [0] => Logo_final_SatuPintu (1).png
    [1] => Logo_final_SatuPintu.png
    [2] => WhatsApp Image 2017-03-24 at 7.04.01 PM.jpeg
)

How to unserialize a string to array

This is a serialized string you should unserialize it using this function unserialize.

<?php
ini_set('display_errors', 1);
$string='a:2:{i:0;s:2:"25";i:1;s:2:"26";}';
print_r(unserialize($string));