unserialize() expects parameter 1 to be string, array given

I am storing data in mysql table by serialize method, now I want to print all data So I wrote mysql query and trying to unserialize because data is in serialize format but unserialize showing error.

Error:

unserialize() expects parameter 1 to be string, array given

Query to fetch all records

$this->db->select('*');
$this->db->from($table);
$result=$this->db->get()->result();
$unserialize_list=unserialize($result);

Answer

Your $result variable contains a multi-dimensional array.

Assuming that some of the data in the table is serialized, and since you have not posted your table schema, here is a sample table that I hope matches your use case:

Id | Data
-------------------
1  | a:2:{s:4:"Name";s:5:"Test1";s:8:"Location";s:9:"Somewhere";}
2  | a:2:{s:4:"Name";s:5:"Test2";s:8:"Location";s:14:"Somewhere Else";}
3  | a:2:{s:4:"Name";s:5:"Test3";s:8:"Location";s:18:"Somewhere Else Too";}

Running this code:

$this->db->select('*');
$this->db->from($table);
$result=$this->db->get()->result();
$unserialize_list=unserialize($result);

Will result in an array of objects, one for each line in your table, like this:

Array
(
    [0] => stdClass Object
        (
            [Id] => 1
            [Data] => a:2:{s:4:"Name";s:5:"Test1";s:8:"Location";s:9:"Somewhere";}
        )

    [1] => stdClass Object
        (
            [Id] => 2
            [Data] => a:2:{s:4:"Name";s:5:"Test2";s:8:"Location";s:14:"Somewhere Else";}
        )

    [2] => stdClass Object
        (
            [Id] => 2
            [Data] => a:2:{s:4:"Name";s:5:"Test3";s:8:"Location";s:18:"Somewhere Else Too";}
        )

)

You need to run the following code in order to access the unserialized data:

foreach ($result as $line) {
    $unserializedData = unserialize($line->Data);
    // Use the unserialized data as needed...
    print_r($unserializedData);
}