PHP array serialize key value CodeIgniter cache - php

Question

I have table name 'preferences' column(key,value)
I use cache in codeigniter
look this :
$pref = $this->ci->db->get('preferences')->result();
$this->ci->cache->save('preferences', $pref, 30000);
save cache :
a:3:{s:4:"time";i:1386246188;s:3:"ttl";i:30000;s:4:"data";a:87:{i:0;O:8:"stdClass":2:{s:3:"key";s:10:"site_title";s:5:"value";s:13:"CARS Big";}i:1;O:8:"stdClass":2:{s:3:"key";s:11:"forum_title";s:5:"value";s:14:"CARS Big forum";}i:2;O:8:"stdClass":2:{s:3:"key";s:14:"forum_per_page";s:5:"value";s:2:"10";}...
Call cache use:
$data = $this->ci->cache->get('preferences');
print_r($data);
output:
Array(
[0] => Array
(
[key] => site_title
[value] => CARS Big
)
[1] => Array
(
[key] => forum_title
[value] => CARS Big forum
)
[2] => Array
(
[key] => forum_per_page
[value] => 10
)
[3] => Array
(
[key] => forum_section_per_page
[value] => 10
)
[4] => Array
(
[key] => forum_replies_per_page
[value] => 5
)
[5] => Array
(
[key] => forum_can_add_pictures
[value] => 1
)
[6] => Array
(
[key] => forum_can_add_poll
[value] => 1
)
[7] => Array
(
[key] => forum_can_set_time_to_close
[value] => 1
)
[8] => Array
(
[key] => forum_can_set_replies_to_close
[value] => 1
)
[9] => Array
(
[key] => forum_auto_active_topics
[value] => 1
)
[10] => Array
(
[key] => market_title
[value] => market CARS Big
)
[11] => Array
(
[key] => market_per_page
[value] => 5
)
[12] => Array
(
[key] => market_section_per_page
[value] => 3
)
)
How do I make the content of the column key is the key
And the column value is the content
Like this:
$data['site_title']
I need $data['site_title'] to print : CARS Big
so as to call this function
function pref($key=NULL)
{
$data = $this->ci->cache->get('preferences');
return $data[$key];
}
**

Answer 1

Essentially you are looking to loop the values and re-assign the keys so something like this could work:
// loop through data
foreach($data as $k=>$v)
{
// unset the original array item to get rid of $data[0], $data[1], $data[2] as so forth
unset($data[$k]);
// $k is a digit (0,1,2,3,4,5,....)
// $v is the array of values so $v['key'] is 'site_title' and $v['value'] is 'CARS Big'
// so essentially we are doing $data['site_title'] = 'CARS Big'; in the line below
$data[$v['key']] = $v['value'];
}

Answer 2

you can't, since the cache save implementation is a fixed process. only if you make your own cache implementation.
but you can perform your return function like this
function pref($key=NULL)
{
// call pref data
$data = $this->ci->cache->get('preferences');
if( ! $data ) {
// cache not present request new
$data = $this->ci->db->get('preferences')->result();
$this->ci->cache->save('preferences', $data, 30000);
}
// loop
foreach( $data as $preferences ) {
if( isset( $preferences['key'] ) && $preferences['key'] == $key ){
return $preferences['value'];
}
}
return false;
}