Concatenate a string inside an array

Not necessarily WordPress specific but thought I’d post in here anyway…

I’m writing a simple plugin that adds a couple of custom post types. I’ve done this many times before, but now trying to make my code a bit more reusable so attempting to make some changes.

My custom post type is defined in a class.

I then define the post type name as a constant so I can reuse it throughout the code. I want to prefix the post type to the beginning of all of my field IDs. Thought I could just do the below but I’m getting an error: Parse error: syntax error, unexpected ‘.’, expecting ‘)’ on the line where I’m trying to concatenate the constant and the field ID.

class PostTypeTeam
    {
        const POST_TYPE = "xyz_team";
        private $_meta  = array(
            array(
                'name' => 'Job title',
                'id' => SELF::xyz_team . '_jobtitle',
                'type' => 'text',
                'std' => '',
                'desc' => ''
                )
         );

….code continues

The $_meta is passed to a function that loops through all the fields and controls the display output.