Php concatenation of arrays

[Mineralex]

I have the next array($columsData):\[code\]Array( [avatar] => Array ( [title] => Avatar [sort] => [no_html_escape] => 1 ) [title] => Array ( [title] => Title [sort] => ))\[/code\]And how can i make this array like this:\[code\]Array( [id] => Array ( [title] => Id [no_html_escape] => 1 ) [avatar] => Array ( [title] => Avatar [no_html_escape] => 1 ) [title] => Array ( [title] => Title [no_html_escape] => 1 ))\[/code\]Thank you.