PHP convert text function

It seems like you're trying to do two different things:

1. Convert a number to a custom string of text.
2. Convert a number (1-12) to the textual representation of that month.

If 1 is what you want, then a switch is probably the simplest and best route to take.

switch($row_psanews['psanews_datem']){
     case 1:
          //code to be performed
          //maybe something like
          $result = "January";
          break; //Break out of this case.
     case 2:
          //code to be performed
          $result = "February";
          break; //Break out of this case.
     //add more cases here...
     //don't forget a default case!
     default:
          //code to be performed if we couldn't account for a possibility
          $result = "Unknown";
          //No break needed, since this is the last check.
}

Check out this page on the Switch Statement.

If 2 is what you need, then PHP has a built in function for that as part of it's Date Function.

<?php
//row_psanews is a whole number (1-12)
$row_psanews[‘psanews_datem’]; //10, in this example
//Create a timestamp
//mktime(hour, minute, second, month, day, year, daylight savings time)
$month = mktime(0,0,0,$row_psanews['psanews_datem'],0,0,0);
//Find the month
$month_name = date("F", $month);
//Write out the month name
echo($month_name);
//Writes out "October"
?>

For formatting the result of the date function check this out.

For other date functions check this out.