query from 2 fields in one result

[greekuser]

hi i have a litlle problem combining results from 2 fields

 

i have this problem in my categories table where i have the Meta tags keys inside a field

 

name = category 1

keys = key1, key2. key3

 

 

i have added 2 more fields with keys to be called in different php files

 

name = category 1

keys = key1, key2, key3

keys2 = key4, key5, key6

 

so index.php calls

$meta['metaKeyWords'] = ($currentCat[0]['ckeys'];

and in source code i get

<meta name="keywords" content="key1, key2, key3" />

 

and index1.php calls

$meta['metaKeyWords'] = ($currentCat[0]['ckeys2']);

and in source code i get

<meta name="keywords" content="key4, key5, key6" />

 

but now i want to combine these 2 fields in the source code to get

<meta name="keywords" content="key1, key2, key3, key4, key5, key6 " />

 

i tried

 

$meta['metaKeyWords'] = ($currentCat[0]['ckeys']),($currentCat[0]['ckeys2']);

but it didn't work

 

any ideas?